Return the list of comment moderators for the given collection.

def get_collection_moderators(collection):
    """
    Return the list of comment moderators for the given collection.
    """
    from invenio_access.engine import acc_get_authorized_emails

    res = list(
        acc_get_authorized_emails(
            'moderatecomments',
            collection=collection))
    if not res:
        return [CFG_WEBCOMMENT_DEFAULT_MODERATOR, ]
    return res