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 Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p15 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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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