mshtml: Added IHTMLImgElement::isMap property implementation. (try 2)

[Zhenbo Li]

This patch supersedes patch 105835

try 2:
1. Check NULL pointer.
2. Fix a critical typo.

---
  dlls/mshtml/htmlimg.c   | 30 ++++++++++++++++++++++++++----
  dlls/mshtml/tests/dom.c | 21 +++++++++++++++++++++
  2 files changed, 47 insertions(+), 4 deletions(-)


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