Werk #5467: Fixed interaction between periodic notifications and acknowledgements.

Component	Core & setup
Title	Fixed interaction between periodic notifications and acknowledgements.
Date	Dec 1, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i2 Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0p21 Checkmk Enterprise (CEE), Checkmk MSP (CME)

When an acknowledgement was removed or expired, any periodic notifications would not be triggered again. This has been fixed.

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