Werk #3715: agent_ipmi_sensors: fixed error handling

Component	Checks & agents
Title	agent_ipmi_sensors: fixed error handling
Date	Aug 5, 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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