Werk #14756: Fix validation of contact groups on deletion

Component	Setup
Title	Fix validation of contact groups on deletion
Date	Sep 19, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p13 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p29 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The validation for used contact groups in event console rules was missing on contact group deletion.

You will now be warned if a contact group is used in such a rule.

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