Werk #14319: Fix error on using folder in rule search

Component	Setup
Title	Fix error on using folder in rule search
Date	May 24, 2022
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) 2.1.0p1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p25 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If the option "Folder" was used in the rule search, submitting the search button lead to the error "The selected element 'None' is not longer available. Please select something else.".

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