Werk #8862: DCD: Fix retrying to activate changes when there are no changes pending

Component	Core & setup
Title	DCD: Fix retrying to activate changes when there are no changes pending
Date	Aug 16, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b7 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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