Werk #13104: Fix duplicated warnings while activating pending changes

Component Setup
Title Fix duplicated warnings while activating pending changes
Date Aug 19, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.1.0b1 2.0.0p10
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

Warnings like "Cannot lookup IP address of ..." on page "Activate pending changes" were shown twice.

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