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 Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p28 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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

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