fix: drop indices if all fragment ids are missing

[wjones127]

Closes #2718

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.27%. Comparing base (e62055d) to head (3f7b9be).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2720      +/-   ##
==========================================
- Coverage   79.31%   79.27%   -0.04%     
==========================================
  Files         227      227              
  Lines       66792    66804      +12     
  Branches    66792    66804      +12     
==========================================
- Hits        52973    52958      -15     
- Misses      10720    10737      +17     
- Partials     3099     3109      +10     

Flag	Coverage Δ
unittests	79.27% <100.00%> (-0.04%)	⬇️

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