mshtml #3: Return NULL instead of empty string in IHTMLElement::get_className.

[jacek at codeweavers.com]

---
  dlls/mshtml/htmlelem.c  |    2 +-
  dlls/mshtml/tests/dom.c |   21 ++++++++++++++++++++-
  2 files changed, 21 insertions(+), 2 deletions(-)


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