mshtml: Properly convert VT_NULL to string in get_elem_attr_value_by_dispid.

[Jacek Caban]

Signed-off-by: Jacek Caban <jacek at codeweavers.com>
---
 dlls/mshtml/htmlelem.c  |  8 ++++++++
 dlls/mshtml/tests/dom.c | 13 ++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)


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