Werk #2779: Fix moving of folders

Component	Setup
Title	Fix moving of folders
Date	Nov 30, 2015
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

This fixes the error message Cannot move folder: A folder with this name already exists in the target folder.

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