Werk #1982: Fixed exception during checking regular checking when having checks without discovery function

Component	Core & setup
Title	Fixed exception during checking regular checking when having checks without discovery function
Date	Feb 10, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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