fix: wrap None in code when used as annotation

[machow]

Addresses #277, by wrapping "None" in code when its used in an annotation.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.28%. Comparing base (8d8252f) to head (d57aab0).
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #415      +/-   ##
==========================================
+ Coverage   89.25%   89.28%   +0.03%     
==========================================
  Files          40       40              
  Lines        3163     3174      +11     
==========================================
+ Hits         2823     2834      +11     
  Misses        340      340              

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[machow]

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