Werk #10144: cisco_temperature.dom: Do not crash if no device levels are present

Component	Checks & agents
Title	cisco_temperature.dom: Do not crash if no device levels are present
Date	Sep 27, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

From version 1.6.0 to 1.6.0p2 the check crashed if no warn/crit levels where provided by the device.

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