commit 9c23e471af04451d3d483be92beef429c499f6ed
Author: Joel Pittet <joel@pittet.ca>
Date:   Sat May 31 15:04:37 2014 -0500

    consistent title_attribute build from @davereid

diff --git a/core/modules/comment/comment.module b/core/modules/comment/comment.module
index 8537b97..57574b7 100644
--- a/core/modules/comment/comment.module
+++ b/core/modules/comment/comment.module
@@ -1466,8 +1466,7 @@ function template_preprocess_comment(&$variables) {
   $variables['content_attributes']['class'][] = 'content';
   $variables['content_attributes'] = new Attribute($variables['content_attributes']);
 
-  $variables['title_attributes'] = isset($variables['title_attributes']) ? $variables['title_attributes'] : array();
-  $variables['title_attributes'] = new Attribute($variables['title_attributes']);
+  $variables['title_attributes'] = isset($variables['title_attributes']) ? new Attribute($variables['title_attributes']) : new Attribute();
 }
 
 /**