./pywallet.py --info --wallet=w.dat --dumpwallet  --datadir=/tmp/1/
Traceback (most recent call last):
  File "./pywallet.py", line 4994, in <module>
    if not keyinfo(options.key, options.keyishex):
  File "./pywallet.py", line 2703, in keyinfo
    pkey = regenerate_key(sec)
  File "./pywallet.py", line 1245, in regenerate_key
    b = ASecretToSecret(sec)
  File "./pywallet.py", line 1237, in ASecretToSecret
    vch = DecodeBase58Check(sec)
  File "./pywallet.py", line 1204, in DecodeBase58Check
    vchRet = b58decode(sec, None)
  File "./pywallet.py", line 1168, in b58decode
    for (i, c) in enumerate(v[::-1]):
TypeError: 'NoneType' object has no attribute '__getitem__'