Fix card post when no cover image has been specified

Author: CalvinAllen

_includes/theme/cards/card-post.html

@@ -39,8 +39,7 @@
   </div>
   {% else %}
   <div class="card-thumbnail {% if thumbnail_size %}card-thumbnail-{{ thumbnail_size }}{% endif %}">
-    <a href="{{ site.url }}{{ url }}"><img alt="{{ title }}"
-        src="{{ site.url }}/assets/images/nocoverimagecoverimage.png" /></a>
+    <a href="{{ url }}"><img alt="{{ title }}" src="{{ site.url }}/assets/images/nocoverimagecoverimage.png" /></a>
   </div>
   {% endif %}