Merge branch 'feature_2023091516_liqian_flowpool_update' into pre-master

video_recall.py

@@ -1078,6 +1078,7 @@ class PoolRecall(object):
                         return level_info['key'], level
                     else:
                         continue
+                return None, None
 
         elif pool_type == 'special':
             key_name_prefix = config_.KEY_NAME_PREFIX_SPECIAL_VIDEOS