fix: don't change tracker state unless severity is set

[jamacku]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 15.07%. Comparing base (4e2950c) to head (834a5b0).
Report is 1 commits behind head on main.

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

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #111   +/-   ##
=======================================
  Coverage   15.07%   15.07%           
=======================================
  Files          11       11           
  Lines         776      776           
  Branches       35       35           
=======================================
  Hits          117      117           
  Misses        653      653           
  Partials        6        6           

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