Fix reset

app.py

@@ -24,6 +24,10 @@ def upload_image(state, image_input):
     return [state, input_image], state
 
 
+def reset():
+    return [[], None], []
+
+
 def save_image_to_local(image: Image.Image):
     # TODO(jykoh): Update so the url path is used, to prevent repeat saving.
     filename = next(tempfile._get_candidate_names()) + '.png'