退款审核bugfix

src/main/java/com/caimei/modules/order/service/CmReturnedPurchaseService.java

@@ -694,6 +694,9 @@ public class CmReturnedPurchaseService extends CrudService<CmReturnedPurchaseDao
             shopOrder.setShopProductAmount(totalCostFee.doubleValue());
             // 应付税费
             shopOrder.setShopTaxFee(shopTaxFee.doubleValue());
+            if (null == shopOrder.getShopPostFee()) {
+                shopOrder.setShopPostFee(0D);
+            }
             // 付供应商
             double shouldPayShopAmount = shopOrder.getShopProductAmount() + shopOrder.getShopPostFee() + shopOrder.getShopTaxFee();
             shopOrder.setShouldPayShopAmount(shouldPayShopAmount);