Werk #5093: dell_poweredge_temp: Fixed device levels handling if they are empty

Component	Checks & agents
Title	dell_poweredge_temp: Fixed device levels handling if they are empty
Date	Aug 9, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0p10 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8p26 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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