Werk #6485: fsc_sc2_voltage: Do not discover not-available voltage units

Component	Checks & agents
Title	fsc_sc2_voltage: Do not discover not-available voltage units
Date	Sep 4, 2018
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 1.5.0p4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Units which are not-available have voltage values 0 V. This may lead to WARN or CRIT because lower or upper device levels are checked.

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