mshtml #13: Return VT_NULL instead of empty string in getAttribute.

[Jacek Caban]

---
  dlls/mshtml/htmlelem.c  |    4 ++--
  dlls/mshtml/tests/dom.c |   33 +++++++++++++++++++++++++++++++--
  2 files changed, 33 insertions(+), 4 deletions(-)
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