feat: n'affiche pas de meta description si aucune renseignée

src/_includes/common-metas.njk

@@ -1,7 +1,7 @@
         <meta charset="utf-8">
         <meta name="viewport" content="width=device-width, initial-scale=1.0">
         <title>{{ title or metadata.title }}</title>
-        <meta name="description" content="{{ description or metadata.description }}">
+        {% if description %}<meta name="description" content="{{ description }}">{% endif %}
         <script type="application/ld+json">
         {
             "@context": "https://schema.org",