Werk #12073: Fix exception on editing users if rulebased notifications are disabled

Component	User interface
Title	Fix exception on editing users if rulebased notifications are disabled
Date	Feb 18, 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) 2.0.0b7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If rulebased notifications were not used, editing a user resulted in an error "(invalid notification period None)".

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