Werk #7706: dmidecode: Fixed crash if any value is empty, eg. "Voltage = ''"

Component	HW/SW inventory
Title	dmidecode: Fixed crash if any value is empty, eg. "Voltage = ''"
Date	Jun 5, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b2 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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