Fix tests

js/models/messages.js

@@ -44,8 +44,10 @@
             return this.get('type') === 'incoming';
         },
         getContact: function() {
+            if (this.collection) {
                 return this.collection.conversation.contactCollection.get(this.get('source'));
             }
+        }
     });
 
     Whisper.MessageCollection = Backbone.Collection.extend({