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e6d54c46 - winVersion.getWinVer: set update revision to 0 if UBR cannot be accessed via Windows Registry.

winVersion.getWinVer: set update revision to 0 if UBR cannot be accessed via Windows Registry. In Windows 8.1, FileNotFoundError is raised when obtainig update revision from WOW64 registry key. Therefore, catch this xception and set UBR to 0.