block video: handle iframe url

layouts/partials/blocks/templates/video/GetIframe

@@ -53,3 +53,9 @@
     {{ end }}
   {{ end }}
 {{ end }}
+{{ if not $identifier }}
+  {{ partial "blocks/templates/video/iframe.html" (dict
+    "url" $url
+    "title" $title
+    )}}
+{{ end }}

layouts/partials/blocks/templates/video/iframe.html

+<iframe 
+  src="{{ .url }}"
+  title="{{ .title }}"
+  loading="lazy">
+</iframe>
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