Werk #12964: Fix editing of labels

Component User interface
Title Fix editing of labels
Date Jun 22, 2021
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 2.0.0p7 2.1.0b1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

If labels were edited, an error message "Only one value per KEY can be used at a time. label_key:label_value is already used." was shown.

A workaround was, to add the regarding label again.

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