Werk #14105: Fix KeyError for "Site ID" painter if site is missing

Component	User interface
Title	Fix KeyError for "Site ID" painter if site is missing
Date	May 2, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0b9 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If the painter "Site ID" is used in views were the site is missing, e.g. "All aggregations", the error "KeyError: 'site'" occurred.

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