mshtml: Accept NULL SAFEARRAY pointers in IHTMLDocument2::write(ln).

[Andrew Nguyen]

This should fix bug 21632.
---
 dlls/mshtml/htmldoc.c       |    3 ++
 dlls/mshtml/tests/htmldoc.c |   46 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+), 0 deletions(-)
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