Werk #13436: Fix 500 errors on BI aggregation endpoints

Component	REST API
Title	Fix 500 errors on BI aggregation endpoints
Date	Nov 2, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p16 Checkmk Enterprise (CEE), Checkmk MSP (CME)

Deleting a aggregation returned 500 status code "permission mismatch"

Deleting a non existing aggregation returned 500 status code, now returns 404

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