msshtml: DefaultLoadRequest can be NULL, check before dereferencing it.

[Alasdair Sinclair]

This prevents wine's iexplorer crashing with google maps.
The gecko SDK also  states that this can be NULL.

Regards

Alasdair

---
  dlls/mshtml/nsio.c |    5 +++++
  1 files changed, 5 insertions(+), 0 deletions(-)
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