Ticket #17492: patch.diff

--- /tmp/formatting.php 2011-05-29 13:04:22.936076904 -0300
+++ /var/www/wordpress-freelancer/wp-includes/formatting.php    2011-05-29 13:04:30.959976031 -0300
@@ -1856,7 +1856,7 @@
  * @param string $text The excerpt. If set to empty an excerpt is generated.
  * @return string The excerpt.
  */
-function wp_trim_excerpt($text) {
+function wp_trim_excerpt($text = '') {
        $raw_excerpt = $text;
        if ( '' == $text ) {
                $text = get_the_content('');