Fix: sql errors into migration scripts

htdocs/install/mysql/migration/3.6.0-3.7.0.sql

@@ -101,6 +101,7 @@ ALTER TABLE llx_product MODIFY COLUMN fk_barcode_type INTEGER NULL DEFAULT NULL;
 -- VPGSQL8.2 ALTER TABLE llx_product ALTER COLUMN fk_barcode_type SET DEFAULT NULL;
 UPDATE llx_product SET fk_barcode_type = NULL WHERE fk_barcode_type = 0;
 ALTER TABLE llx_product ADD INDEX idx_product_fk_barcode_type (fk_barcode_type);
+UPDATE llx_product SET fk_barcode_type = NULL WHERE fk_barcode_type NOT IN (SELECT rowid from llx_c_barcode_type);
 ALTER TABLE llx_product ADD CONSTRAINT fk_product_barcode_type FOREIGN KEY (fk_barcode_type) REFERENCES  llx_c_barcode_type (rowid);