Exception in function register:
 Traceback (most recent call last):
  File "submit.cgi", line 92, in decorated
    return f(*args, **kwargs)
  File "submit.cgi", line 369, in register
    u = cgi_username()
  File "submit.cgi", line 73, in cgi_username
    (user, domain) = addr.split('@')
AttributeError: 'NoneType' object has no attribute 'split'