Werk #16037: folder_config/host_config: No longer accept non-existent site

Component	REST API
Title	folder_config/host_config: No longer accept non-existent site
Date	Dec 22, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0p19 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

You can no longer set a non-existent site on folders and hosts.

When called with a non-existent site as an attribute the endpoints now return the status code 400.

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