Werk #12939: Fix crash in virtual host tree if there are no tags

Component Checks & Agents
Title Fix crash in virtual host tree if there are no tags
Date Oct 11, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.1.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

When creating a virtual Host tree there was an AttributeError when no TAGS are set.

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