fix: should not exit if the pr is invalid

[LinuxSuRen]

fix LinuxSuRen/argo-workflow-atomic-plugin#21

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.36%. Comparing base (746d56b) to head (296fa63).
Report is 10 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #44   +/-   ##
=======================================
  Coverage   34.36%   34.36%           
=======================================
  Files           6        6           
  Lines         323      323           
=======================================
  Hits          111      111           
  Misses        211      211           
  Partials        1        1           

Flag	Coverage Δ
unittests	34.36% <ø> (ø)

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