Update app.py

app.py

@@ -151,7 +151,7 @@ async def login_with_token(access_token: str, refresh_token: str):
             user_name = user_id.data[0]["username"]
 
         except:
-            user_name = 'null'
+            user_name = ''
 
         json = {
             "code": status.HTTP_200_OK,