Werk #13021: Fix crash in omd_status clustered check

Component	Checks & agents
Title	Fix crash in omd_status clustered check
Date	Jul 7, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Before this werk, a clustered omd_status check may have crashed with KeyError (sitename).

This should now be fixed.

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