Werk #13398: RESTAPI: discovery: Service Item may be Null

Component	REST API
Title	RESTAPI: discovery: Service Item may be Null
Date	Oct 27, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p14 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The schema of service_item was a string which could not be null, although services without a service item exist. Null for a service item is now valid.

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