Werk #17855: Show error message if graph collection is missing

Component	Reporting & availability
Title	Show error message if graph collection is missing
Date	Apr 30, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.4.0p1 Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

If an graph collection was no longer available, the report showed a Traceback.

Now only a error message like "Graph collection 'graph_collection_1' does not exist" is rendered.

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