Werk #2366: carel_sensors: fix crash in case of missing temperature sensor

Component	Checks & agents
Title	carel_sensors: fix crash in case of missing temperature sensor
Date	Jun 29, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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