mshtml: Improved error handling in get_node calls.

[Jacek Caban]

---
  dlls/mshtml/htmldoc.c        |   31 ++++++++------
  dlls/mshtml/htmldoc3.c       |   24 +++++++----
  dlls/mshtml/htmlelemcol.c    |   31 ++++++++++++--
  dlls/mshtml/htmlevent.c      |   24 +++++++----
  dlls/mshtml/htmlform.c       |    7 ++-
  dlls/mshtml/htmlnode.c       |   96 
++++++++++++++++++++++++++++++++----------
  dlls/mshtml/htmloption.c     |    9 +++-
  dlls/mshtml/htmlselect.c     |    9 ++--
  dlls/mshtml/mshtml_private.h |    2 +-
  dlls/mshtml/mutation.c       |    5 +-
  dlls/mshtml/nsembed.c        |    7 +++-
  dlls/mshtml/txtrange.c       |    5 ++-
  12 files changed, 179 insertions(+), 71 deletions(-)


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