'Return the folder separator for the IMAP repository
This requires that self.imapserver has been initialized with an
acquireconnection() or it will still be `None`'

def getsep(self):

    assert (self.imapserver.delim != None), ("'%s'    repository    called    getsep()    before    the    folder    separator    was    queried    from    the    server" % self)
    return self.imapserver.delim
