Fix SafeArrayCopy For NULL pvData

[Robert Shearman]

ChangeLog:
It is allowed to copy a SAFEARRAY with a NULL pvData, as long as
cbElements is non-zero. Add a test for this and fix the safe array code.

  dlls/oleaut32/safearray.c       |   10 +++++++++-
  dlls/oleaut32/tests/safearray.c |   15 ++++++++++++++-
  2 files changed, 23 insertions(+), 2 deletions(-)

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