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Werk #12619: Fix error on editing downtimes without specifying a new downtime start

Component User interface
Title Fix error on editing downtimes without specifying a new downtime start
Date Apr 1, 2021
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
2.1.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME)
2.0.0p2 Checkmk Enterprise (CEE), Checkmk MSP (CME)

If you edited a downtime and used the option "Change downtime end" without also specifying "Change downtime start", an internal error "'<' not supported between instances of 'NoneType' and 'int'" occurred.

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