[UI] Area for displaying params should be hidden when not populated

[samamou]

This parameter panel, responsible for displaying params, as per the docs, if i understand correctly, is always shown, even when it's empty and has no data to display.

Expected behavior

Current (unexpected) behavior

where this space is empty (and should be hidden)

1. When on any other tab, other than # 1 (Device Explorer)
   
   
2. When user hasn't selected an address/device, yet.
   
   

Suggested fix:

easier said than done.. but does this make sense?

panel->hide();  // When there is no data / nothing is selected
panel->show();  // When there is data to display? onSelection()

[samamou]

starting to look at .ossia/score/src/plugins/score-plugin-deviceexplorer/Explorer/Explorer/AddressItemModel.cpp is this the right place to look? @jcelerier