Werk #15955: Fix 'NoneType' object has no attribute 'startswith' crash in views

Component	The Checkmk Micro Core
Title	Fix 'NoneType' object has no attribute 'startswith' crash in views
Date	Jun 29, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p5 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p31 Checkmk Pro, Checkmk Ultimate MT

Certain views, such as the builtin view Linux [CPU & Memory], might have crashed with the error message mentioned above.

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