message: Switch to BIP341's suggested scheme for outputs without script
diff: @@ -787,7 +787,7 @@ def TaprootSignatureHash(txTo, spent_utxos, hash_type, input_index = 0, scriptpa
  def taproot_tree_helper(scripts):
  if len(scripts) == 0:
  - return ([], bytes(0 for _ in range(32)))
  + return ([], bytes())
  if len(scripts) == 1:
  # One entry: treat as a leaf
  script = scripts[0]
  