Django translate_url not working with optional parameters

I am using django 1.11.

My url is:

url(r'^apply(?:/(?P<pk>[\d-]+)/(?P<slug>[\w-]+))?.html$', applyview, name='applyview'),

Line to tranlate url:

translate_url('/nl/job/apply.html', "fr")

Django internal function:

def translate_url(url, lang_code):
    """
    Given a URL (absolute or relative), try to get its translated version in
    the `lang_code` language (either by i18n_patterns or by translated regex).
    Return the original URL if no translated version is found.
    """
    parsed = urlsplit(url)
    try:
        match = resolve(parsed.path)
    except Resolver404:
        pass
    else:
        to_be_reversed = "%s:%s" % (match.namespace, match.url_name) if match.namespace else match.url_name
        with override(lang_code):
            try:
                url = reverse(to_be_reversed, args=match.args, kwargs=match.kwargs)
            except NoReverseMatch:
                pass
            else:
                url = urlunsplit((parsed.scheme, parsed.netloc, url, parsed.query, parsed.fragment))
    return url

Django can not tranlate url  get an error NoReverseMatch because kwargs are None. ({'pk': None, 'slug': None}).

By my parameters are optional. 

Does anyone have an idea, how can that be solved?

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