new check for tken

app.py

@@ -16,13 +16,13 @@ paper_central_df = PaperCentral()
 
 
 def hide_if_logged_in(oauth_token: Optional[gr.OAuthToken]):
-    if oauth_token is None:
+    if oauth_token is None or oauth_token.token is None:
         return gr.update(visible=True)
     return gr.update(visible=False)
 
 
 def display_user_info(oauth_token: Optional[gr.OAuthToken]):
-    if oauth_token is None:
+    if oauth_token is None or oauth_token.token is None:
         return ""
     user_info = whoami(oauth_token.token)
     avatar_url = user_info.get("avatarUrl", "")