fix: remove key error when running on non pull request

[ReenigneArcher]

Description

The action would fail if the event was not a pull request. This PR fixes that.

Screenshot

Issues Fixed or Closed

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

Branch Updates

LizardByte requires that branches be up-to-date before merging. This means that after any PR is merged, this branch
must be updated before it can be merged. You must also
Allow edits from maintainers.

• I want maintainers to keep my branch updated

[codecov]

Codecov Report

Merging #6 (c016f11) into master (d3bcebf) will increase coverage by 35.55%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master       #6       +/-   ##
===========================================
+ Coverage   57.97%   93.52%   +35.55%     
===========================================
  Files           1        1               
  Lines         138      139        +1     
===========================================
+ Hits           80      130       +50     
+ Misses         58        9       -49     

Files	Coverage Δ
action/main.py	93.52% <100.00%> (+35.55%)	⬆️