Update app.py

app.py

@@ -301,7 +301,13 @@ def update_code_and_docs(select):
 
 def update_code_and_docs_on_start(url_params: gr.Request):
     params = get_params(url_params)
-    transform_name = params.transform_name if params.transform_name is not None else DEFAULT_TRANSFORM
+    if params.transform_name is not None and params.transform_name not in transforms_map:
+        gt.Warning(f"Sorry, `{params.transform_name}` transform is not supported at the moment :(")
+        transform_name = DEFAULT_TRANSFORM
+    elif params.transform_name in transforms_map:
+        transform_name = params.transform_name
+    else:
+        transform_name = DEFAULT_TRANSFORM
     return gr.update(value=transform_name)
 
 with gr.Blocks() as demo: