Add error handling for contest file upload in app.py

- Implemented a try-except block to manage potential errors when uploading a contest CSV file.
- Added a warning message to prompt users to upload a valid contest CSV if the upload fails, enhancing user experience and data integrity.

app.py

@@ -124,7 +124,10 @@ with tab1:
             if 'Contest_file' not in st.session_state:
                 st.session_state['Contest_upload'] = st.file_uploader("Upload Contest File (CSV or Excel)", type=['csv', 'xlsx', 'xls'])
                 st.session_state['player_info'], st.session_state['info_maps'] = grab_contest_player_info(db, sport_select, type_var, date_select, contest_name_var, contest_id_map)
-                st.session_state['Contest_file'] = pd.read_csv(st.session_state['Contest_upload'])
+                try:
+                    st.session_state['Contest_file'] = pd.read_csv(st.session_state['Contest_upload'])
+                except:
+                    st.warning('Please upload a Contest CSV')
             else:
                 pass