AttributeError: 'str' object has no attribute 'decode

[Rust64]

Just in case he @gurnec didn't lose interest in this repository, there's this issue now:
File "decrypt_bitcoinj_seed.pyw", line 313, in
wallet = load_wallet(wallet_file, get_password)
File "decrypt_bitcoinj_seed.pyw", line 126, in load_wallet
password = get_password_fn(takes_long)
File "decrypt_bitcoinj_seed.pyw", line 301, in get_password
return password.decode('ASCII') if isinstance(password, str) else password
AttributeError: 'str' object has no attribute 'decode'```

[sheckandar]

It looks like spending PIN must be removed before wallet backup. Otherwise, this error happens.