Update src/streamlit_app.py

src/streamlit_app.py

@@ -595,7 +595,7 @@ if st.session_state.execute_batch_analysis and 'json_data_for_batch' in st.sessi
                         "analysis_result": response,
                         "context": retrieved_ctx
                     }
-                    fieldnames = list(item[0].keys()) if data_list else []
+                    fieldnames = list(item[0].keys()) if item else []
                     output_string_buffer = io.StringIO()
                     writer = csv.DictWriter(
                         output_string_buffer,