Werk #6069: netextreme_fan: Fixed crash if no speed information is sent from device

Component	Checks & agents
Title	netextreme_fan: Fixed crash if no speed information is sent from device
Date	May 9, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0p32 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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