avoid panic if no idle pods

[davidkarlsen]

No description provided.

[codecov]

Codecov Report

Merging #161 (9f8ba93) into master (5296578) will increase coverage by 0.38%.
The diff coverage is 77.78%.

@@            Coverage Diff             @@
##           master     #161      +/-   ##
==========================================
+ Coverage   62.13%   62.50%   +0.38%     
==========================================
  Files           2        2              
  Lines         198      200       +2     
==========================================
+ Hits          123      125       +2     
  Misses         55       55              
  Partials       20       20              

Impacted Files	Coverage Δ
controllers/githubactionrunner_controller.go	55.36% <77.78%> (+0.54%)	⬆️

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