Werk #6494: win_video: Fixed crash if driver date is missing

Component	HW/SW inventory
Title	win_video: Fixed crash if driver date is missing
Date	Sep 11, 2018
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) 1.5.0p5 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0p36 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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