Werk #3565: wmi checks: Fixed deprecation warning when WMI keys can not be found in agent output

Component	Checks & agents
Title	wmi checks: Fixed deprecation warning when WMI keys can not be found in agent output
Date	May 4, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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