Implement error handling for name matching in app.py

- Added a try-except block around the name matching function to handle potential errors gracefully.
- Display a warning message to the user if name matching cannot be completed, improving user experience and guiding next steps.
- Ensured that session state variables for adjusted dataframes are only set when name matching is successful, maintaining data integrity.

app.py

@@ -75,7 +75,10 @@ with tab1:
     if Contest_file and projections_file:
         st.subheader("Name Matching functions")
         if 'Adj_Contest' not in st.session_state:
-            st.session_state['Adj_Contest'], st.session_state['Adj_projections_df'], st.session_state['Adj_ownership_df'], st.session_state['Adj_actual_df'] = find_name_mismatches(st.session_state['Contest'], st.session_state['projections_df'], st.session_state['ownership_df'], st.session_state['actual_df'])
+            try:    
+                st.session_state['Adj_Contest'], st.session_state['Adj_projections_df'], st.session_state['Adj_ownership_df'], st.session_state['Adj_actual_df'] = find_name_mismatches(st.session_state['Contest'], st.session_state['projections_df'], st.session_state['ownership_df'], st.session_state['actual_df'])
+            except:
+                st.warning('Please manage name matching to move forward')
         st.session_state['Adj_projections_df']['salary'] = (st.session_state['Adj_projections_df']['salary'].astype(str).str.replace(',', '').astype(float).astype(int))
         st.session_state['ownership_dict'] = dict(zip(st.session_state['Adj_ownership_df']['Player'], st.session_state['Adj_ownership_df']['Own']))
         st.session_state['actual_dict'] = dict(zip(st.session_state['Adj_actual_df']['Player'], st.session_state['Adj_actual_df']['FPTS']))