Werk #12697: Fix problem with removing acknowledgements

Component	Core & setup
Title	Fix problem with removing acknowledgements
Date	Sep 27, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p12 Checkmk Enterprise (CEE), Checkmk MSP (CME)

If the comment to an acknowledgement was removed first, for example, from the "Monitor | Comments" menu, the acknowledgement would stick and could not be removed anymore.

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