Clear session state for contest file uploads in app.py to prevent conflicts

- Implemented logic to clear the session state for 'Contest_file_helper' and 'Contest_file' when selecting a contest or uploading a new file, ensuring a fresh start for data processing.
- Enhanced user experience by preventing potential data conflicts during contest file uploads, maintaining the integrity of the uploaded data.

app.py

@@ -71,6 +71,10 @@ with tab1:
         st.subheader("Contest File")
         st.info("Go ahead and upload a Contest file here. Only include player columns and an optional 'Stack' column if you are playing MLB.")
         if parse_type == 'DB Search':
+            if 'Contest_file_helper' in st.session_state:
+                del st.session_state['Contest_file_helper']
+            if 'Contest_file' in st.session_state:
+                del st.session_state['Contest_file']
             contest_name_var = st.selectbox("Select Contest to load", name_parse)
             if 'Contest_file' not in st.session_state:
                 if st.button('Load Contest Data', key='load_contest_data'):
@@ -78,14 +82,16 @@ with tab1:
             else:
                 pass
         elif parse_type == 'Manual':
+            if 'Contest_file_helper' in st.session_state:
+                del st.session_state['Contest_file_helper']
+            if 'Contest_file' in st.session_state:
+                del st.session_state['Contest_file']
             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'])
-                if st.session_state['Contest_upload'] is not None:
-                    st.session_state['Contest_file'] = pd.read_csv(st.session_state['Contest_upload'])
+                st.session_state['Contest_file'] = pd.read_csv(st.session_state['Contest_upload'])
                 st.session_state['Contest_file_helper'] = grab_contest_data(sport_select, name_parse.iloc[0], contest_id_map, date_select)
             else:
                 pass
-        st.write(st.session_state['Contest_file'].head(10))
         if 'Contest_file' in st.session_state:
             if 'Contest_file_helper' in st.session_state:
                 st.session_state['Contest'], st.session_state['ownership_df'], st.session_state['actual_df'], st.session_state['salary_df'], st.session_state['team_df'], st.session_state['pos_df'], st.session_state['entry_list'], check_lineups = load_contest_file(st.session_state['Contest_file'], st.session_state['Contest_file_helper'], sport_select)