'Remove a random domain name/domain object pair from this dictionary and
return it as a tuple.
@rtype: 2-L{tuple} of (E{1}) L{bytes}, (E{2}) L{IDomain} provider or
L{None}
@return: A domain name/domain object pair.
@raise KeyError: When this dictionary is empty.'

def popitem(self):

    return self.domains.popitem()
