Werk #2724: Discovery check: Fixed exception in simulation mode when no cache file present

Component	Core & setup
Title	Discovery check: Fixed exception in simulation mode when no cache file present
Date	Nov 6, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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