modify

search/views/topic.py

@@ -22,7 +22,7 @@ def get_discover_page_topic_ids(user_id,device_id,size,query_type=TopicPageType.
         redis_field_list = [b'have_read_topic_id']
         redis_field_val_list = redis_client.hmget(redis_key,redis_field_list)
 
-        have_read_topic_id_list = json.loads(redis_field_val_list[0])
+        have_read_topic_id_list = json.loads(redis_field_val_list[0]) if redis_field_val_list[0] else []
 
         recommend_topic_ids = []
         topic_id_list = TopicUtils.get_recommend_topic_ids(user_id=user_id, offset=0, size=size,query_type=query_type,filter_topic_id_list=have_read_topic_id_list)