Werk #7472: eltek_fans: Do not discover fans without speed information

Component	Checks & agents
Title	eltek_fans: Do not discover fans without speed information
Date	May 20, 2019
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) 1.5.0p17 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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