Another oleaut32 fix for VB

[Ann and Jason Edmeades]

Nasty one this - MSDN documents VarBstrCat as returning 0 if either parm is
null. What it neglects to mention is that the parms are still used and
treated as empty strings, so concatenation is still required. Took ages to
pin down a trap on this :-)

Changelog
o Ensure VarBstrCat handles null parms as per windows and actually does the
concatenation even for null args

Jason

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