msxml3/schema: Null pointer for schema uri should be treated as empty

[Nikolay Sivov]

Spotted in valgrind log as invalid read - a buffer passed to libxml2 was 
allocated as zero length heap block, after some testing it showed up 
that null uri acts the same as empty uri.

I will add more tests for all places we're using xmlChar_from_wchar() to 
see if we could change it to return empty xmlChar string instead of 
pointer to zero length block in case of null input.
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