Werk #14457: Fix crash on "Event history of host" view

Component User interface
Title Fix crash on "Event history of host" view
Date Jun 23, 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)
2.1.0p4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)
2.0.0p28 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The view created an error like "Exception: Painter 'history_what_explained' returned invalid result".

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