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Werk #15120: Fix possible error on using host or service level filter

Component User interface
Title Fix possible error on using host or service level filter
Date Jan 3, 2023
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
2.1.0p19 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

If you used host or service level filter in views with an event datasource, e.g. "Events of host & services", the error "Internal error: 'NoneType' object is not subscriptable" occurred.

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