Checkmk Werk 12561: Fix KeyError (site_id) crash on host properties page (2.0.0p2 regression)

ID: 12561 Title: Fix KeyError (site_id) crash on host properties page (2.0.0p2 regression) Component: Setup Level: 1 Class: Bug fix Version: 2.1.0i1 When opening the host properties page in the setup an exception KeyError ("site_id") could appear in distributed setups. This issue was triggered when a folder has a site attribute configured which does not have a site specific global setting defined. This situation is now cleanly handled to prevent this exception.