Werk #17826: Remove "None" warnings on global setting groups

Component	Setup
Title	Remove "None" warnings on global setting groups
Date	Mar 21, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Due to a faulty data type casting, None values were displayed as global setting groups warnings.

This has now been fixed.

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