Werk #13609: Don't crash when a 'Assign SLA definition to service' rule is saved

Component	User interface
Title	Don't crash when a 'Assign SLA definition to service' rule is saved
Date	Jan 14, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0p19 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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