=== wordpress/local/xmlrpc.php
==================================================================
--- wordpress/local/xmlrpc.php	(revision 4852)
+++ wordpress/local/xmlrpc.php	(revision 4853)
@@ -6,7 +6,9 @@
 $_COOKIE = array();
 
 # fix for mozBlog and other cases where '<?xml' isn't on the very first line
-$HTTP_RAW_POST_DATA = trim($HTTP_RAW_POST_DATA);
+if (isset($HTTP_RAW_POST_DATA)) {
+	$HTTP_RAW_POST_DATA = trim($HTTP_RAW_POST_DATA);
+}
 
 include('./wp-config.php');