Werk #13244: wut_webio: Fix AssertionError on rules page

Component	User interface
Title	wut_webio: Fix AssertionError on rules page
Date	Sep 21, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p12 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

When opening the rules page for "W&T WebIO" from the effective parameters page of a host, an AssertionError occured.

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