Werk #7001: dell_om_fans: Fixed crash if only one device level (crit) is given

Component	Checks & agents
Title	dell_om_fans: Fixed crash if only one device level (crit) is given
Date	Jan 9, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p12 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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