minor fix +test

[PharmCat]

• Minor plotting fix
• minconc & maxconc ignore NaN and missing
• manual initial commit

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.29%. Comparing base (55736fc) to head (6568f8e).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   95.17%   95.29%   +0.12%     
==========================================
  Files          16       16              
  Lines        1617     1617              
==========================================
+ Hits         1539     1541       +2     
+ Misses         78       76       -2     

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