feat: assign custom 404 pages with the website theme (1.8.0)

templates/page.html.twig

@@ -7,12 +7,12 @@
     {% set seoTitle = page.seo_title|default('') ?: page.document.title %}
     <title>{{ seoTitle }}</title>
     <meta name="description" content="{{ page.document.description }}">
-    <link rel="canonical" href="{{ canonical }}">
+    {% if canonical|default(null) %}<link rel="canonical" href="{{ canonical }}">{% endif %}
     {% if page.robots|default('index') != 'index' %}<meta name="robots" content="noindex, follow">{% endif %}
     <meta property="og:title" content="{{ seoTitle }}">
     <meta property="og:description" content="{{ page.document.description }}">
     <meta property="og:type" content="{{ page.type|default('page') == 'post' ? 'article' : 'website' }}">
-    <meta property="og:url" content="{{ canonical }}">
+    {% if canonical|default(null) %}<meta property="og:url" content="{{ canonical }}">{% endif %}
     {# In der Vorschau des Editors gibt es den Websitenamen nicht - dort fehlt das Feld einfach. #}
     {% if page.website_name|default('') %}<meta property="og:site_name" content="{{ page.website_name }}">{% endif %}
     <meta property="og:locale" content="{{ page.locale == 'de' ? 'de_DE' : page.locale }}">