Check_MK Werk 5262: Fix bug in agent bakery (regression #5261, since 1.4.0p17)

ID: 5262 Title: Fix bug in agent bakery (regression #5261, since 1.4.0p17) Component: agents Level: 2 Class: Bug fix Version: 1.5.0i1 Werk #5261 introduced a bug that made it impossible to bake new agents for some specific rulesets. This would result in error messages like the following: <pre> "TypeError: key ('custom', 'win_certificates/lib/local/win_certificates.ps1') is not a string" </pre> After an update, no further action is required.