MMT-3919: Remove invalid group permissions

[htranho]

Overview

What is the feature?

MMT displays invalid group permissions, which show up with empty group name in the UI.

What is the Solution?

Remove invalid group permissions so they don't show up.

What areas of the application does this impact?

Single permission view.

Testing

See test session

Attachments

See ticket.

Checklist

• I have added automated tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.68%. Comparing base (d7ea081) to head (458f90c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1318   +/-   ##
=======================================
  Coverage   97.68%   97.68%           
=======================================
  Files         366      366           
  Lines        5743     5743           
  Branches     1205     1195   -10     
=======================================
  Hits         5610     5610           
  Misses        132      132           
  Partials        1        1           

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