Werk #15121: Fix possible AssertionError on rule search

Component	Setup
Title	Fix possible AssertionError on rule search
Date	Jan 18, 2023
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) 2.1.0p20 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If you e.g. searched for tags in the rule search, an error like "AssertionError" could occur.

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