make a widget's start method optional

public/javascripts/diaspora.js

@@ -28,9 +28,12 @@
 
   Diaspora.WidgetCollection.prototype.init = function() {
     this.initialized = true;
+    
     for(var widgetId in this.collection) {
+      if(this.collection[widgetId].hasOwnProperty("start")) {
         this.collection[widgetId].start();
       }
+    }
   };
 
   Diaspora.widgets = new Diaspora.WidgetCollection();