Werk #8644: Improved error reporting when trying to edit not existing report elements

Component	Reporting & availability
Title	Improved error reporting when trying to edit not existing report elements
Date	Dec 5, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i3 Checkmk Pro, Checkmk Ultimate MT

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