404 Page is included in the sitemap

[ineptian]

Technically I don't think the 404 page should be included in the sitemap, but please correct me if I am wrong. I went ahead and added this in the sitemap to prevent it from showing up. Let me know if there is a better way to do it! Thanks!

        {% if '404' not in page.url %}
        <url>
            <loc>{{ absoluteUrl }}</loc>
            <lastmod>{{ page.date | htmlDateString }}</lastmod>
        </url>
        {% endif %}