Werk #4387: Git integration: Fixed error handling when enabling it while git is not installed

Component	Setup
Title	Git integration: Fixed error handling when enabling it while git is not installed
Date	Feb 20, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.4.0b3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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