Werk #3100: fixed exception when trying to create a wato folder when that folder already exists

Component	Setup
Title	fixed exception when trying to create a wato folder when that folder already exists
Date	Mar 15, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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