update contrast_similar

trans2es/models/contrast_similar.py

@@ -47,12 +47,11 @@ class ContrastSimilar(models.Model):
 
                 return similar_user_id_list
 
-
         except:
 
             logging.error("catch exception,err_msg:%s" % traceback.format_exc())
 
-            return 0
+            return None
 
 
 class Topics(models.Model):