conditinal video tag

_layouts/default.html

@@ -40,11 +40,13 @@
 {% endunless %}
 {% include cookie-consent.html %}
 {% include scripts.html %}
+{% if page.video_path %}
 <div class="fullscreen-bg">
   <video autoplay muted loop poster="{{ page.image }}" class="fullscreen-bg__video">
     <source src="{{ page.video_path }}" type="video/mp4">
   </video>
 </div>
+{% endif %}
 </body>
 </html>