Handling the error on contest refresh

app.py

@@ -1508,11 +1508,14 @@ if selected_tab == 'Data Load':
                     help="Type to search contest names."
                 )
                 selected_contest = None
-                if selected_label != "None":
+                if selected_label is not None and selected_label != "None":
                     selected_idx = contest_labels.index(selected_label)
                     selected_contest = contest_options[selected_idx]
 
                 if st.button("Load Selected Contest Pricing", key="load_selected_contest_pricing"):
+                    if selected_label is None:
+                        st.warning("Select a contest after refreshing the contest list.")
+                        st.stop()
                     if selected_contest is None:
                         st.warning("Select a contest before loading pricing.")
                         st.stop()