fix: refs #7779 refactor collection

db/routines/vn/procedures/collection_new.sql

@@ -245,7 +245,7 @@ BEGIN
 				SELECT wagon INTO vFreeWagonFk
 					FROM tTrain
 					GROUP BY wagon
-					HAVING SUM(IFNULL(ticketFk, 0)) = 0
+					HAVING COUNT(ticketFk) = 0 
 					ORDER BY wagon
 					LIMIT 1;
 
@@ -262,7 +262,7 @@ BEGIN
 							JOIN (SELECT wagon
 								FROM tTrain
 								GROUP BY wagon
-								HAVING SUM(IFNULL(ticketFk, 0)) = 0
+								HAVING COUNT(ticketFk) = 0 
 							) sub ON sub.wagon = tt.wagon;
 				END IF;
 			END IF;