Adding =countif to an =sumproduct range (Maybe)

I am having an issue with my formula. =SUMPRODUCT((A2:A2000=D3)*(B2:B2000)) The formula works great except I need to add countif greater than 0 to this and I can't figure out how. The issue is (Attached), that in cell D3 if you have nothing entered (This is what the user would search by), it (E3) will count every customer with a 0 ship to in column A. I want to ignore those. Also, the info that is in columns A & B will be added from another program (iSeries navigator). These numbers are not manually entered. Only D3 would be for the user.

Thanks for any help,

Jay