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]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.62%. Comparing base (fc9f3cc) to head (4cf65be).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #415      +/-   ##
==========================================
+ Coverage   89.58%   89.62%   +0.03%     
==========================================
  Files          40       40              
  Lines        3198     3209      +11     
==========================================
+ Hits         2865     2876      +11     
  Misses        333      333              

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[machow]

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