Werk #12289: Backup: Fix adding / editing backup jobs with manual schedule

Component Setup
Title Backup: Fix adding / editing backup jobs with manual schedule
Date Mar 10, 2021
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 2.0.0p1 2.1.0b1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

When adding or editing backup jobs with a "manual schedule" configuration this lead to an exception "TypeError (argument of type 'NoneType' is not iterable)" in previous 2.0.0 releases.

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