How do Determine if a cursor is empty after doing select statement. The following is not working:

			Select crsprod, crsitemcode, sum(crsrequestamt) as inreq, sum(crsaccptamt) as whsaccpt, crsdelivertype, Count(*) as duplicate From crs_grid1 ;
			  	Group By  crsprod, crsitemcode, crsdelivertype HAVING duplicate > 1 AND crsdelivertype > 1 INTO CURSOR crs_find_dup
			IF isnull('crs_find_dup')
				MESSAGEBOX('empty cursor',0,'')
			ELSE
				MESSAGEBOX('not empty cursor',0,'')
			ENDIF 	

thanks
Nick