Werk #4978: ipmi: Ignore sensors with state 'na'

Component	Checks & agents
Title	ipmi: Ignore sensors with state 'na'
Date	Jul 18, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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