setname: error if only one date tag is present

[niklasbogensperger]

Steps:

1. use setname on an image file with only one date tag
2. abort the operation (does this also occur when selecting the only option?)
3. error message shows up

--- file: example.JPG
1  - filemodifydate     2020-01-01 01.01.01
Which of these looks correct [1-1]? Abort by inputting anything else. abort
setname:88: failed to compile regex: invalid character range
Your reply was not a valid selection, so the process was aborted. No changes were made to this file.