Werk #3975: Improved error handling when trying to edit not existing global setting

Component	Setup
Title	Improved error handling when trying to edit not existing global setting
Date	Nov 7, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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