Catch case of wrong atlas when registering dcgs

[stephen-riggs]

If the atlas is not in the visit folder we want to avoid crashing. This takes a guess at where the atlas should have been, and will then fall into the else statement below when it tries to glob for an atlas in that location.

Also puts a try-catch around the call from the multigrid control. Means the analyser will not crash but could leave us without a dcg message.

[codecov]

Codecov Report

❌ Patch coverage is 30.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.87%. Comparing base (db351d1) to head (cc72af3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #744      +/-   ##
==========================================
- Coverage   46.90%   46.87%   -0.03%     
==========================================
  Files          91       91              
  Lines        9673     9679       +6     
  Branches     1273     1274       +1     
==========================================
  Hits         4537     4537              
- Misses       4917     4922       +5     
- Partials      219      220       +1     

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