Werk #13380: Validate use of contact groups in dashboards on deletion

Component	Setup
Title	Validate use of contact groups in dashboards on deletion
Date	Oct 28, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p15 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If a contact group was removed that was still used in a dashboard, the contact group was silently removed from the dashboard and it may no longer be possible to access the dashboard.

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