Werk #2532: Fixed undefined variable exception in prediction in rare cases

Component	User interface
Title	Fixed undefined variable exception in prediction in rare cases
Date	Aug 31, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

In some rare cases missing or broken prediction files could cause an exception

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