Werk #14282: Master control: Fix rendering errors of dead sites

Component	User interface
Title	Master control: Fix rendering errors of dead sites
Date	Jul 15, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0p7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Rendering the master control snapin could fail with an exception like "TypeError: Unsupported type <class 'livestatus.MKLivestatusSocketError'>" in case a site was not reachable.

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