fix: polish

app.py

@@ -50,7 +50,7 @@ with gr.Blocks() as demo:
         ecg_viewer = gr.Image(interactive=False, label="The selected ecg is")
 
     with gr.Row():
-        alfred_result = gr.Markdown(value={}, label="Alfred said that")
+        alfred_result = gr.Markdown(value="", label="Alfred said that")
 
     gr_df.select(fn=get_ecg_id_from_dataframe, inputs=gr_df, outputs=ecg_id_output)
     ecg_id_output.change(