Werk #8929: cisco_fan: Fixed crash if device status is unknown

Component	Checks & agents
Title	cisco_fan: Fixed crash if device status is unknown
Date	Aug 21, 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) 1.6.0b7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p22 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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