Ticket #17492: patch.diff

formatting.php

@@ -1856 +1856 @@
  * @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('');