Werk #1803: Fixed exception in Check_MK prediction page

Component	User interface
Title	Fixed exception in Check_MK prediction page
Date	Jan 7, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The page was showing up an exception right after opening the page.

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