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 Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p5 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.4.0p36 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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