Index: wp-includes/default-widgets.php
===================================================================
--- wp-includes/default-widgets.php	(revision 28397)
+++ wp-includes/default-widgets.php	(working copy)
@@ -1039,7 +1039,7 @@
 		while ( stristr($link, 'http') != $link )
 			$link = substr($link, 1);
 		$link = esc_url(strip_tags($link));
-		$title = esc_attr(strip_tags($item->get_title()));
+		$title = trim( esc_attr( strip_tags( $item->get_title() ) ) );
 		if ( empty($title) )
 			$title = __('Untitled');