Fix for pyteomics change that returns empty list instead of None for no mods

[bhavyak7-lab]

• Updated CHANGELOG.md
• Updated array checking for N-terminal and C-terminal

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.62%. Comparing base (e506ada) to head (081b512).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #88   +/-   ##
=======================================
  Coverage   96.62%   96.62%           
=======================================
  Files          24       24           
  Lines        1008     1008           
=======================================
  Hits          974      974           
  Misses         34       34           

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[wfondrie]

Thanks!