Assuming that you want to check ONE field in your row you can use the following:
if(cursor.isNull(cursor.getColumnIndexOrThrow("column_index") || cursor.getString(cursor.getColumnIndexOrThrow("column_index")).equals(""))
to check if it is null or empty.
Where "column_index"
is the name of the column in your database
Edit: If what you want is the ROW position just use cursor.getPosition()
to get the row position in your cursor.