'Opt out from a quarantined subreddit'

@require_oauth2_scope('subscribe')
@noresponse(VUser(), VModhash(), sr=VSRByName('sr_name'))
def POST_quarantine_optout(self, sr):

    if (not sr):
        return abort(404, 'not    found')
    else:
        g.events.quarantine_event('quarantine_opt_out', sr, request=request, context=c)
        QuarantinedSubredditOptInsByAccount.opt_out(c.user, sr)
    return self.redirect('/')
