feat:npe

service/src/main/java/com/jiejing/fitness/finance/service/pay/convert/RefundConvert.java

@@ -61,7 +61,7 @@ public class RefundConvert {
         .remark(params.getRefundReason())
         .existRelatedTrans(true)
         .relatedTransNo(params.getPayTransNo())
-        .extra(Optional.of(params.getExtra()).map(e -> JSON.toJSONString(e)).orElse("{}"))
+        .extra(Optional.ofNullable(params.getExtra()).map(e -> JSON.toJSONString(e)).orElse("{}"))
         .tradingTime(now)
         .createTime(now)
         .updateTime(now)