Get the latest featured community.

        :param start_date: Date after which the featuring starts
        :returns: Community object or None
        :rtype: `invenio_communities.models.Community` or None

def get_featured_or_none(cls, start_date=None):
        """Get the latest featured community.

        :param start_date: Date after which the featuring starts
        :returns: Community object or None
        :rtype: `invenio_communities.models.Community` or None
        """
        start_date = start_date or datetime.utcnow()

        comm = cls.query.filter(
            FeaturedCommunity.start_date <= start_date
        ).order_by(
            cls.start_date.desc()
        ).first()
        return comm if comm is None else comm.community