'Get seen entry by ID'

@etag
@api.response(200, model=seen_object_schema)
def get(self, seen_entry_id, session):

    try:
        seen_entry = seen.get_entry_by_id(seen_entry_id, session=session)
    except NoResultFound:
        raise NotFoundError(u'Could    not    find    entry    ID    {0}'.format(seen_entry_id))
    return jsonify(seen_entry.to_dict())
