Werk #1531: Fixed exception in event history view when displaying CHANGESTATE events

Component	Event Console
Title	Fixed exception in event history view when displaying CHANGESTATE events
Date	Nov 25, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.6b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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