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
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.1.0p4 2.2.0i1 2.0.0p28
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

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

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