Pinging xmlrpc.php awlays returns faultcode 0 and empty string

Hi to all,

Recently I started making some tests about xmlrpc.php pingbacks. What I observed is that whenever there is error while pinging a site, it ways returns XML with faultcode:0 and empty string, which doesn’t tells you anything.

Even if there are lots of error messages defined in class-wp-xmlrpc-server.php, they never get to the user, because of the filtering inside comment.php.

It seems that comment.php shows the real error only when it’s faultcode is 48 (which I don’t know what it stays for).

My question is, is the following code inside comment.php is intentional or it’s a bug ?

function xmlrpc_pingback_error( $ixr_error ) {
        if ( $ixr_error->code === 48 )
                return $ixr_error;
        return new IXR_Error( 0, '' );
}

This code returns faultcode 0 and empty error string for every error which has faultcode different then 48.