Update app.py

app.py

@@ -8,11 +8,13 @@ with gr.Blocks() as demo:
             label="Hub Dataset ID",
             placeholder="Search for dataset id on Huggingface",
             search_type="dataset",
-            value="HuggingFaceFW/fineweb",
+            value="",
         )
 
     @gr.render(inputs=dataset_name)
     def embed(name):
+        if not name:
+            return gr.Markdown("### No dataset provided")
         html_code = f"""
         <iframe
           src="https://huggingface.co/datasets/{name}/embed/viewer/default/train"