vbscript: Treat empty regexp pattern the same way as NULL pattern.

[Jacek Caban]

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 dlls/vbscript/tests/regexp.vbs | 17 +++++++++++++++++
 dlls/vbscript/vbregexp.c       | 28 +++++++++++-----------------
 2 files changed, 28 insertions(+), 17 deletions(-)


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