Werk #4740: mysql: Fixed crash if instance is not available anymore

Component	Checks & agents
Title	mysql: Fixed crash if instance is not available anymore
Date	May 24, 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 1.4.0 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.2.8p23 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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