Don't fail when story is missing severity

[jamacku]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 10.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 15.03%. Comparing base (1d71bad) to head (7aababa).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/action.ts	0.00%	8 Missing ⚠️
src/bugzilla.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #121      +/-   ##
==========================================
- Coverage   15.07%   15.03%   -0.05%     
==========================================
  Files          11       11              
  Lines         776      785       +9     
  Branches       35       35              
==========================================
+ Hits          117      118       +1     
- Misses        653      661       +8     
  Partials        6        6              

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