Werk #14460: Fix error on rule search

Component	User interface
Title	Fix error on rule search
Date	Jun 27, 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 2.1.0p5 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p27 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Searching for e.g. "Group" or "Ineffective" could lead to an error message like "The selected element 'None' is not longer available.".

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