Werk #1986: Added nicer error message when calling the rename host page with a non existant host

Component	Setup
Title	Added nicer error message when calling the rename host page with a non existant host
Date	Feb 20, 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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