Improve CSV file loading logic to ensure pricing flag is set only when a file is provided

app.py

@@ -761,7 +761,8 @@ if selected_tab == 'Data Load':
                     mime="text/csv"
                 )
             st.session_state['csv_file'] = load_csv(csv_file)
-            st.session_state['pricing_loaded'] = True
+            if csv_file is not None:
+                st.session_state['pricing_loaded'] = True
             try:
                 st.session_state['csv_file']['Salary'] = st.session_state['csv_file']['Salary'].astype(str).str.replace(',', '').astype(int)
             except:
@@ -788,8 +789,9 @@ if selected_tab == 'Data Load':
                     st.session_state['csv_file']['Position'] = st.session_state['csv_file']['Position'].replace('D', 'DST', regex=False)
                 except:
                     pass
-            st.success('Projections file loaded successfully!')
-            st.dataframe(st.session_state['csv_file'].head(10))
+            if st.session_state['csv_file'] is not None:
+                st.success('Projections file loaded successfully!')
+                st.dataframe(st.session_state['csv_file'].head(10))
         
     with col2:
         st.subheader("Portfolio File")