Werk #4171: perle_psmu: fixed value error

Component	Checks & agents
Title	perle_psmu: fixed value error
Date	Dec 19, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Some power supplies report no power or voltage if the device state is failed.

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