Werk #13434: Fix 500 status when deleting non existing downtimes

Component	REST API
Title	Fix 500 status when deleting non existing downtimes
Date	Oct 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) 2.1.0p15 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

It was possible that checkmk returned an error message like "Permission mismatch. See the server logs for more information." when trying to delete a non existing downtime.

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