update 学生乐保增加，删除和修改

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

@@ -75,7 +75,7 @@ public class SellOrderServiceImpl extends BaseServiceImpl<Integer, SellOrder> im
         }
 
         BigDecimal hasRouteBalance = BigDecimal.ZERO;
-        BigDecimal goodsTotalBalance = goodsTotalPrice.multiply(balance).divide(totalAmount, 2, BigDecimal.ROUND_DOWN);
+        BigDecimal goodsTotalBalance = totalAmount.compareTo(BigDecimal.ZERO) <= 0 ? BigDecimal.ZERO : goodsTotalPrice.multiply(balance).divide(totalAmount, 2, BigDecimal.ROUND_DOWN);
         AccountType accountType = sysPaymentConfigService.checkAccountType(PaymentChannelEnum.valueOf(order.getPaymentChannel()), order.getMerNos());
 
         List<SellOrder> sellOrderList = goodsService.subtractStock(goodsIds, accountType);
@@ -91,7 +91,8 @@ public class SellOrderServiceImpl extends BaseServiceImpl<Integer, SellOrder> im
             }
             goodsPrice = nowGoods.getDiscountPrice();
 
-            BigDecimal goodsBalance = goodsTotalBalance.multiply(goodsPrice).divide(goodsTotalPrice, 2, BigDecimal.ROUND_DOWN);
+            BigDecimal goodsBalance = goodsTotalPrice.compareTo(BigDecimal.ZERO) <= 0 ? BigDecimal.ZERO :
+                    goodsTotalBalance.multiply(goodsPrice).divide(goodsTotalPrice, 2, BigDecimal.ROUND_DOWN);
             if (i == goodsNum) {
                 goodsBalance = goodsTotalBalance.subtract(hasRouteBalance);
             }