Werk #739: Availablity: Prevent crash if the notification period is missing

Component	Core & setup
Title	Availablity: Prevent crash if the notification period is missing
Date	Mar 28, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.5i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

There are some setup where the notification period of a nagios object was set to NULL.

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