Remove tool tip from unregistered user errors

// FREEBIE

js/views/message_view.js

@@ -10,13 +10,10 @@
     var ErrorIconView = Whisper.View.extend({
         templateName: 'error-icon',
         className: 'error-icon-container',
-        render_attributes: function() {
-            var message;
+        initialize: function() {
             if (this.model.name === 'UnregisteredUserError') {
-                message = i18n('unregisteredUser');
                 this.$el.addClass('unregistered-user-error');
             }
-            return { message: message };
         }
     });
     var NetworkErrorView = Whisper.View.extend({