Fix nil pointer dereference during GitHub Hook parsing

[6543]

close #5680
regression of #5618

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 21.23%. Comparing base (6fa1635) to head (4e97bc7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5681   +/-   ##
=======================================
  Coverage   21.23%   21.23%           
=======================================
  Files         423      423           
  Lines       38280    38280           
=======================================
  Hits         8130     8130           
  Misses      29396    29396           
  Partials      754      754           

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[xoxys]

It can only be a bug or a regression. As the PR that introduced this issue was released already its a bug - regression label removed.