Handle mixed types in ResidueId comparison

[amorehead]

• Handles mixed types (e.g., str and None) in ResidueId comparisons

[cbouy]

Thanks for the contribution @amorehead, I'll just add some tests to your PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.44%. Comparing base (597083d) to head (8cfa394).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #235   +/-   ##
=======================================
  Coverage   94.44%   94.44%           
=======================================
  Files          21       21           
  Lines        1511     1513    +2     
=======================================
+ Hits         1427     1429    +2     
  Misses         84       84           

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