'Delete any YadisServiceManager with this starting URL and
suffix from the session.
If there is no service manager or the service manager is for a
different URL, it silently does nothing.
@param force: True if the manager should be deleted regardless
of whether it\'s a manager for self.url.'

def destroyManager(self, force=False):

    if (self.getManager(force=force) is not None):
        key = self.getSessionKey()
        del self.session[key]
