Werk #3049: esx_vsphere_hostsystem.mem_usage_cluster: Fixed exception when no thresholds configured

Component	Checks & agents
Title	esx_vsphere_hostsystem.mem_usage_cluster: Fixed exception when no thresholds configured
Date	Feb 11, 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

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