Werk #12546: Tags: Fix exception when changing existing tag ID

Component	Setup
Title	Tags: Fix exception when changing existing tag ID
Date	Mar 12, 2021
Checkmk Editon	Checkmk Raw (CRE)
Checkmk Version	2.1.0i1 2.0.0p1
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed

When changing the tag id of an already used tag and choose "Fix affected folders, hosts and rules" when saving those changes, the following exception appears: TypeError (isinstance() arg 2 must be a class, type, or tuple of classes and types).

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