update BigDecimal类型初始化及空值校验

src/main/java/com/m2pool/lease/task/OrderAndPayTask.java

@@ -863,6 +863,7 @@ public class OrderAndPayTask {
                     .sellerEmail(leaseShop.getUserEmail())
                     .receivedAmount(totalRealAmount.subtract(fee))
                     .feeRate(feeRate)
+                    .sellerFee(fee)
                     .build();
 
             reocrdList.add(build);