Tweak the attachment handling for Hubzilla support

templates/utils.html

@@ -54,7 +54,7 @@
 	<ul>
 	{% endif %}
 	{% for a in obj.attachment %}
-	{% if a.mediaType.startswith("image/") %}
+    {% if (a.mediaType and a.mediaType.startswith("image/")) or (a.type and a.type == 'Image') %}
     <a href="{{ a.url | get_attachment_url(None) }}"><img src="{{a.url | get_attachment_url(720) }}" class="img-attachment"></a>
 	{% else %}
 	<li><a href="{{a.url }}" class="l">{% if a.filename %}{{ a.filename }}{% else %}{{ a.url }}{% endif %}</a></li>