update 乐团报名只有租赁时候的bug

mec-biz/src/main/java/com/ym/mec/biz/service/impl/SellOrderServiceImpl.java

@@ -208,7 +208,9 @@ public class SellOrderServiceImpl extends BaseServiceImpl<Integer, SellOrder> im
                 sellOrders.add(sellOrder);
             }
         }
-        sellOrderDao.batchInsert(sellOrders);
+        if (sellOrders.size() > 0) {
+            sellOrderDao.batchInsert(sellOrders);
+        }
         return sellOrders;
     }