Werk #3126: fixed crash in some wmi-based checks when items disappear from the agent output

Component	Checks & agents
Title	fixed crash in some wmi-based checks when items disappear from the agent output
Date	Apr 27, 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 1.2.8b13 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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