added safety to avoid updating conv when it is empty - index error

main.py

@@ -347,7 +347,8 @@ with gr.Blocks(
     )
 
     edit_conv_btn.click(
-        fn=lambda: gr.update(visible=True),
+        fn=lambda conv: gr.update(visible=bool(conv)),
+        inputs=[conversation_data],
         outputs=edit_conv_col,
     )