mshtml: Added IHTMLTable::width property implementation. (try 5)

[Zhenbo Li]

This patch supersedes 104193, 104110, 103576.

try 5:
     1. Don't free an uninitialized string in getter
     2. Don't do that in setter
     3. Would set the BSTR to NULL in getter if failed

Thank you for your patience:)
---
  dlls/mshtml/htmltable.c | 95 
++++++++++++++++++++++++++++++++++++++++++++++---
  dlls/mshtml/tests/dom.c | 48 +++++++++++++++++++++++++
  2 files changed, 139 insertions(+), 4 deletions(-)


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