临时接口-重试余额支付订单退款

jsowell-pile/src/main/java/com/jsowell/pile/service/programlogic/AbstractProgramLogic.java

@@ -439,6 +439,9 @@ public abstract class AbstractProgramLogic implements InitializingBean {
         BigDecimal returnPrincipal = null; // 退回本金金额
         BigDecimal returnGift = null; // 退回赠送金额
 
+        if (discountAmount == null) {
+            discountAmount = BigDecimal.ZERO;
+        }
         // 实际消费金额 = 订单消费金额 - 订单折扣金额
         BigDecimal amountDue = orderAmount.subtract(discountAmount);