shdocvw(2/2): ignore VT_ERROR arguments to WebBrowser_Navigate2

[Juan Lang]

> Ignoring VT_ERROR just masks a previous error.

Hm.. are you sure?  These are input arguments, not results.  This isn't
the only app that gets further with this patch.  See also bug 6166.

I guess a test case is the only answer.

--Juan

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