Werk #12465: Tag configuration: Fixed broken "Tag usage" page

Component	Setup
Title	Tag configuration: Fixed broken "Tag usage" page
Date	Apr 27, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p6 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The "Tag Usage" page failed with an exception if a tag group contained an empty tag.

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