teacher NULL dep fix

db/StoredProcedures.sql

@@ -1313,7 +1313,8 @@ BEGIN
 	SELECT departments.ID 
 	INTO DepID
 	FROM `departments`
-	WHERE departments.Name = DepartmentName
+	WHERE 	departments.Name = DepartmentName OR
+			(DepartmentName = '' AND departments.Name IS NULL)
 	LIMIT 1;
 	IF DepID <= 0 THEN
 		RETURN -1;