fallback local user avatar when net sucks

This was fixed at 4ddfc0f88c, but not in the "messages" screen.
Luckily, my ISP sucks on a regular basis,
so it didn't take long until this happened to me.

templates/messages.html

@@ -25,7 +25,7 @@
               <div class="panel-body">
                 <div class="media avatars32">
                   <a class="pull-left thumbnail" href="{{site_root}}/user/{{username}}">
-                    <img class="media-object avatar" src="{{avatar}}" alt="{{fullname}}">
+                    <img class="media-object avatar" src="{{#avatar}}{{.}}{{/avatar}}{{^avatar}}{{site_root}}/assets/img/twister-64.jpg{{/avatar}}" alt="{{fullname}}">
                   </a>
                   <div class="media-body">
                     <ul class="nav nav-pills">