Merge branch 'yifan' of ASJ_ADS/sync_amz_data into master

sync_amz_data/public/sp_api_client.py

@@ -454,6 +454,7 @@ class SpApiRequest:
                 print("插入错误：",e)
                 conn.rollback()
                 return '出错回滚'
+        return ''
 
     # def get_listing_info(self, sku,seller_id): # desprecated
     #     listingClient = ListingsItems(credentials=self.credentials, marketplace=self.marketplace)