Incorrect variable name meant that if there was no manual excerpt for an entry there was no excerpt sent with the trackback.

git-svn-id: http://svn.automattic.com/wordpress/trunk@420 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/b2edit.php

@@ -139,7 +139,7 @@ switch($action) {
 				} else {
 					$the_excerpt = (strlen(strip_tags($content)) > 255) ? substr(strip_tags($content), 0, 252) . '...' : strip_tags($content);
 				}
-                $excerpt = stripslashes($excerpt);
+                $excerpt = stripslashes($the_excerpt);
                 $trackback_urls = explode(',', $HTTP_POST_VARS['trackback_url']);
                 foreach($trackback_urls as $tb_url) {
                     $tb_url = trim($tb_url);