msxml3: Always have a libxml doc associated with a domdoc object, even if the object has no nodes.

[Huw Davies]

This means we don't need to add checks for NULL libxml node ptrs in our node implementation.

---

 dlls/msxml3/domdoc.c       |   93 +++++++++++++++++++++++---------------------
 dlls/msxml3/tests/domdoc.c |    8 ++++
 2 files changed, 56 insertions(+), 45 deletions(-)
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