Werk #14473: Fix GUI crash if unknown theme was used in global settings

Component User interface
Title Fix GUI crash if unknown theme was used in global settings
Date Aug 18, 2022
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
2.1.0p11 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If an unknown theme was configured in the global settings within "User interface theme", the GUI crashed without an error message.

This was seen with a configured classic theme in 1.6, an update to 2.0 without problems and the mentioned crash on update to 2.1.

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