Let say that you imported a spreadsheet that has 5 columns (can have many more). Put FileMaker in find mode by clicking the "Find" icon in the Status Toolbar or selecting "Find Mode" under the "View" menu. In all five columns enter the equals character "=" (without quotes) then press the enter key or click the "Perform Find" icon. All the blank records will be displayed. Now go up to the "Records..." menu and select "Delete Found Records.." to delete all the empty records.
This can be automated with scripts very easily, recommend looking into the "Perform Find" and "Delete All Records" script steps.
That worked beautifully and simply. Thank you very much.