Werk #3056: vms_cpu: Fixed exception when having thresholds configured

Component	Checks & agents
Title	vms_cpu: Fixed exception when having thresholds configured
Date	Feb 12, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.2.8b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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