fix 空指针

luma/src/main/java/com/yhlxj/service/midjourney/impl/LumaServiceImpl.java

@@ -212,6 +212,9 @@ public class LumaServiceImpl implements LumaService {
         JSONObject jsons = JSONUtil.parseObj(json);
         VideoTask videoTask = JSONUtil.toBean(jsons, VideoTask.class);
         VideoTask.Data videoTaskData = videoTask.getData();
+        if (videoTaskData == null) {
+            return;
+        }
         String taskId = videoTaskData.getId();
         LumaUserConversation conversation = conversationMapper.selectOne(Wrappers.lambdaQuery(LumaUserConversation.class)
                 .eq(LumaUserConversation::getTaskId, taskId)