Werk #3338: Improved error handling when host to be edited does not exist

Component	Setup
Title	Improved error handling when host to be edited does not exist
Date	Mar 21, 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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