Werk #1884: Fixed exception in virtual host tree snapin

Component	User interface
Title	Fixed exception in virtual host tree snapin
Date	Jan 30, 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

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