Werk #10621: Fix bug where scheduler would become inactive

Component Core & Setup
Title Fix bug where scheduler would become inactive
Date Feb 19, 2020
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.0.0i1 1.6.0p10 1.5.0p25
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

Certain configurations let CMC schedule jobs with invalid timestamps. These jobs would never be scheduled and let the schedulers in a nonoperating state, resulting in stale hosts and services.

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