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 Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0p5 Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p31 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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

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