Werk #11942: webapi: fix TypeError when formatting tags

Component	Core & setup
Title	webapi: fix TypeError when formatting tags
Date	Feb 22, 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 2.0.0p2 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p22 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

When formatting an error message, the formatting code crashed when the tag contained "None" as a value.

This behavior has been fixed. No further action is needed.

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