Enhance session state checks for contest information in app.py

- Added an additional condition to verify the presence of 'display_contest_info' in session state, improving data handling and preventing potential errors.
- This update ensures that the application maintains stability and provides a better user experience by managing contest data more effectively.

app.py

@@ -261,6 +261,7 @@ with tab2:
         st.session_state['field_stack_frame'] = create_stack_exposures(working_df)
         st.session_state['display_contest_info'] = working_df.copy()
 
+    if 'display_contest_info' in st.session_state:
         with st.expander("Info and filters"):
             st.info("Note that any filtering here needs to be reset manually, i.e. if you parse down the specific users and want to reset the table, just backtrack your filtering by setting it back to 'All'")
             if st.button('Clear data', key='reset3'):
@@ -303,6 +304,7 @@ with tab2:
                         st.session_state['display_contest_info'] = st.session_state['display_contest_info'][mask]
                     if st.session_state['low_entries_var'] and st.session_state['high_entries_var']:
                         st.session_state['display_contest_info'] = st.session_state['display_contest_info'][st.session_state['display_contest_info']['EntryCount'].between(st.session_state['low_entries_var'], st.session_state['high_entries_var'])]
+    
     if 'display_contest_info' in st.session_state:
         # Initialize pagination in session state if not exists
         if 'current_page' not in st.session_state: