msxml3: tests/xmlelem.c: VT_EMPTY is not a string

[Dan Kegel]

Casting a VT_EMPTY to a string gets you a null string.
The test was doing that and taking the string length, then comparing to zero.
Better to simply compare to null; that's a stronger test, and
avoids generating a behind-the-scenes exception.

Passes on Wine and XP, and makes Valgrind output a bit easier on the eyes.
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