Werk #12139: Backup schedule: Fix empty "time of day" selection

Component Setup
Title Backup schedule: Fix empty "time of day" selection
Date Feb 23, 2021
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 2.0.0b8 2.1.0b1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

The "time of day" field could previously be saved with an empty field. This resulted to an exception (TypeError (cannot unpack non-iterable NoneType object)) on the resulting page. The previously saved configs can now be read.

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