version: Added support for Blank and NULL strings in VerQueryValueA/W

[Alistair Leslie-Hughes]

Hi,
    Fixes http://bugs.winehq.org/show_bug.cgi?id=6393

    Tested on: Win98, w2k, XP.

Changelog:
	version: Added support for Blank and NULL strings in VerQueryValueA/W

Best Regards
  Alistair Leslie-Hughes



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