🐛 Account for cell source being a string

[Koncopd]

Needed mostly for pycharm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.55%. Comparing base (c28c19b) to head (924212d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #286      +/-   ##
==========================================
+ Coverage   88.51%   88.55%   +0.03%     
==========================================
  Files          24       24              
  Lines        1054     1057       +3     
==========================================
+ Hits          933      936       +3     
  Misses        121      121              

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