Werk #8444: Fixed core crash when a time period was empty

Component	The Checkmk Micro Core
Title	Fixed core crash when a time period was empty
Date	Mar 17, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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