Update app.py

app.py

@@ -29,7 +29,8 @@ if uploaded_file is not None:
 
     # Fetch unique users
     user_list = df['user'].unique().tolist()
-    user_list.remove('group_notification')
+    if 'group_notification' in user_list:
+        user_list.remove('group_notification')
     user_list.sort()
     user_list.insert(0, "Overall")