def try_url(url_name):
    """
    Mimics Django's ``url`` template tag but fails silently. Used for
    url names in admin templates as these won't resolve when admin
    tests are running.
    """
    from warnings import warn
    warn("try_url is deprecated, use the url tag with the 'as' arg instead.")
    try:
        url = reverse(url_name)
    except NoReverseMatch:
        return ""
    return url