fix(消息通知): 修复发送自定义webhook的消息时空指针的问题

backend/src/main/java/io/metersphere/notice/sender/AbstractNoticeSender.java

@@ -61,6 +61,7 @@ public abstract class AbstractNoticeSender implements NoticeSender {
         if (noticeModel.getParamMap().containsKey("customFields")) {
             String customFields = (String) noticeModel.getParamMap().get("customFields");
             JSONArray array = JSON.parseArray(customFields);
+            if (CollectionUtils.isNotEmpty(array)) {
                 for (Object o : array) {
                     JSONObject jsonObject = JSON.parseObject(o.toString());
                     String name = jsonObject.getString("name");
@@ -71,6 +72,7 @@ public abstract class AbstractNoticeSender implements NoticeSender {
                     }
                 }
             }
+        }
 
         // 处理 userIds 中包含的特殊值
         noticeModel.setReceivers(getRealUserIds(messageDetail, noticeModel, messageDetail.getEvent()));