- Patch #73582 by chx: fixed glitch with return value checking in XML-RPC client.

includes/xmlrpc.inc

@@ -345,7 +345,7 @@ function xmlrpc_request($method, $args) {
 
 function xmlrpc_error($code = NULL, $message = NULL) {
   static $xmlrpc_error;
-  if ($code) {
+  if (isset($code)) {
     $xmlrpc_error = new stdClass();
     $xmlrpc_error->is_error = TRUE;
     $xmlrpc_error->code = $code;