Handle activities for deleted objects.

src/templates/attract/index.jade

@@ -43,11 +43,13 @@
 
 			ul
 				| {% for act in activities['_items'] %}
+				| {% if act.link %}
 				li
 					a(href="{{ act.link }}")
 						img.actor-avatar(src="{{ act['actor_user']['email'] | gravatar }}")
 						span.date(title="{{ act._created }}") {{ act._created | pretty_date_time }}
 						span.actor {{ act['actor_user']['full_name'] }}
 						span.verb {{ act.verb }}
+				| {% endif %}
 				| {% endfor %}
 | {% endblock %}