generate-xdmf: Better error message for running on 1D data

[wthrowe]

generate-xdmf doesn't handle 1D data, for obvious reasons, but if you run it on such the error is not great:

╭─────────────────────────────── Traceback (most recent call last) ────────────────────────────────╮
│ /home/wthrowe/spectre-work/bin/python/spectre/Visualization/GenerateXdmf.py:412 in generate_xdmf │
│                                                                                                  │
│   409 │   │   │   # Construct the grid for this observation                                      │
│   410 │   │   │   observation = vol_subfile[temporal_id]                                         │
│   411 │   │   │   xmf_timestep_grid.append(                                                      │
│ ❱ 412 │   │   │   │   _xmf_grid(                                                                 │
│   413 │   │   │   │   │   observation,                                                           │
│   414 │   │   │   │   │   topo_dim=topo_dim,                                                     │
│   415 │   │   │   │   │   filename=filename_in_output,                                           │
│                                                                                                  │
│ ╭─────────────────────────────────────────── locals ───────────────────────────────────────────╮ │
│ │                  coordinates = 'InertialCoordinates'                                         │ │
│ │                     filename = 'ScalarWavePlaneWave1DVolume0.h5'                             │ │
│ │           filename_in_output = 'ScalarWavePlaneWave1DVolume0.h5'                             │ │
│ │                       h5file = <HDF5 file "ScalarWavePlaneWave1DVolume0.h5" (mode r)>        │ │
│ │                      h5files = [                                                             │ │
│ │                                │   (                                                         │ │
│ │                                │   │   <HDF5 file "ScalarWavePlaneWave1DVolume0.h5" (mode    │ │
│ │                                r)>,                                                          │ │
│ │                                │   │   'ScalarWavePlaneWave1DVolume0.h5'                     │ │
│ │                                │   )                                                         │ │
│ │                                ]                                                             │ │
│ │                  observation = <HDF5 group "/TimeStep.vol/ObservationId9039309379094327651"  │ │
│ │                                (14 members)>                                                 │ │
│ │                       output = 'ScalarWavePlaneWave1DVolume.xmf'                             │ │
│ │               relative_paths = True                                                          │ │
│ │                   start_time = None                                                          │ │
│ │                    stop_time = None                                                          │ │
│ │                       stride = 1                                                             │ │
│ │                 subfile_name = 'TimeStep.vol'                                                │ │
│ │                     subfiles = ['TimeStep.vol']                                              │ │
│ │                  temporal_id = 'ObservationId9039309379094327651'                            │ │
│ │      temporal_ids_and_values = [                                                             │ │
│ │                                │   ('ObservationId9039309379094327651', np.float64(0.0)),    │ │
│ │                                │   ('ObservationId12883908474027188397', np.float64(0.25)),  │ │
│ │                                │   ('ObservationId3786051601093629449', np.float64(0.5)),    │ │
│ │                                │   ('ObservationId17146722629450312499', np.float64(0.75)),  │ │
│ │                                │   ('ObservationId369472061476405199', np.float64(1.0)),     │ │
│ │                                │   ('ObservationId18302919226753717980', np.float64(1.25)),  │ │
│ │                                │   ('ObservationId937941305938352075', np.float64(1.5)),     │ │
│ │                                │   ('ObservationId17662617711199699994', np.float64(1.75)),  │ │
│ │                                │   ('ObservationId13175458069999519017', np.float64(2.0))    │ │
│ │                                ]                                                             │ │
│ │                         time = np.float64(0.0)                                               │ │
│ │                    timesteps = {                                                             │ │
│ │                                │   'ObservationId9039309379094327651': <Element 'Grid' at    │ │
│ │                                0x7f2f15ce4270>                                               │ │
│ │                                }                                                             │ │
│ │                     topo_dim = 1                                                             │ │
│ │ use_tetrahedral_connectivity = False                                                         │ │
│ │                  vol_subfile = <HDF5 group "/TimeStep.vol" (9 members)>                      │ │
│ │                   xmf_domain = <Element 'Domain' at 0x7f2f15ca78d0>                          │ │
│ │                     xmf_root = <Element 'Xdmf' at 0x7f2f15ca7e20>                            │ │
│ │            xmf_timestep_grid = <Element 'Grid' at 0x7f2f15ce4270>                            │ │
│ │                xmf_timesteps = <Element 'Grid' at 0x7f2f15ca7920>                            │ │
│ ╰──────────────────────────────────────────────────────────────────────────────────────────────╯ │
│                                                                                                  │
│ /home/wthrowe/spectre-work/bin/python/spectre/Visualization/GenerateXdmf.py:230 in _xmf_grid     │
│                                                                                                  │
│   227 │   │   │   topology_type = {3: "Tetrahedron", 2: "Triangle"}[topo_dim]                    │
│   228 │   │   │   connectivity_name = "tetrahedral_connectivity"                                 │
│   229 │   │   else:                                                                              │
│ ❱ 230 │   │   │   topology_type = {3: "Hexahedron", 2: "Quadrilateral"}[topo_dim]                │
│   231 │   │   │   connectivity_name = "connectivity"                                             │
│   232 │   │                                                                                      │
│   233 │   │   xmf_topology = _xmf_topology(                                                      │
│                                                                                                  │
│ ╭─────────────────────────────────────────── locals ───────────────────────────────────────────╮ │
│ │                  coordinates = 'InertialCoordinates'                                         │ │
│ │                          dim = 1                                                             │ │
│ │                      extents = array([[2],                                                   │ │
│ │                                │      [2],                                                   │ │
│ │                                │      [2],                                                   │ │
│ │                                │      [2],                                                   │ │
│ │                                │      [2],                                                   │ │
│ │                                │      [2],                                                   │ │
│ │                                │      [2],                                                   │ │
│ │                                │      [2],                                                   │ │
│ │                                │      [2],                                                   │ │
│ │                                │      [2],                                                   │ │
│ │                                │      [2],                                                   │ │
│ │                                │      [2],                                                   │ │
│ │                                │      [2],                                                   │ │
│ │                                │      [2],                                                   │ │
│ │                                │      [2],                                                   │ │
│ │                                │      [2]], dtype=uint64)                                    │ │
│ │                     filename = 'ScalarWavePlaneWave1DVolume0.h5'                             │ │
│ │                filling_poles = False                                                         │ │
│ │                    grid_path = 'ScalarWavePlaneWave1DVolume0.h5:/TimeStep.vol/ObservationId… │ │
│ │                 num_elements = 16                                                            │ │
│ │                   num_points = np.uint64(32)                                                 │ │
│ │                  observation = <HDF5 group "/TimeStep.vol/ObservationId9039309379094327651"  │ │
│ │                                (14 members)>                                                 │ │
│ │                 subfile_name = 'TimeStep.vol'                                                │ │
│ │                  temporal_id = 'ObservationId9039309379094327651'                            │ │
│ │                     topo_dim = 1                                                             │ │
│ │                total_extents = <HDF5 dataset "total_extents": shape (16,), type "<u8">       │ │
│ │ use_tetrahedral_connectivity = False                                                         │ │
│ │                     xmf_grid = <Element 'Grid' at 0x7f2f15ce4770>                            │ │
│ ╰──────────────────────────────────────────────────────────────────────────────────────────────╯ │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
KeyError: 1

[nilsdeppe]

Can you try out #6374? That will hopefully give you something better...