fix(task): 处理空消息情况以确保消息更新逻辑正确

src/task/task.service.ts

@@ -258,7 +258,7 @@ export class TaskService implements OnModuleInit {
         return await this.taskRepository.update(
             { id },
             {
-                message: data.message || old.message,
+                message: data.message === '' ? '' : data.message || old.message,
                 img: data.img || old.img,
                 dynamicMessage: data.dynamicMessage || old.dynamicMessage,
                 rcsWait: data.rcsWait,