Werk #4130: Improved error handling when trying to edit not existant rules

Component	Setup
Title	Improved error handling when trying to edit not existant rules
Date	Dec 5, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.2.8p15 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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