XML-RPC: Avoid a PHP notice in ::pingback_ping() if page title was …

…not found.

Props RedSand.
Fixes #36727.
Built from https://develop.svn.wordpress.org/trunk@38620


git-svn-id: http://core.svn.wordpress.org/trunk@38563 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-xmlrpc-server.php

@@ -6323,9 +6323,10 @@ public function pingback_ping( $args ) {
 		$remote_source = preg_replace( "/<\/*(h1|h2|h3|h4|h5|h6|p|th|td|li|dt|dd|pre|caption|input|textarea|button|body)[^>]*>/", "\n\n", $remote_source );
 
 		preg_match( '|<title>([^<]*?)</title>|is', $remote_source, $matchtitle );
-		$title = $matchtitle[1];
-		if ( empty( $title ) )
-			return $this->pingback_error( 32, __('We cannot find a title on that page.' ) );
+		$title = isset( $matchtitle[1] ) ? $matchtitle[1] : '';
+		if ( empty( $title ) ) {
+			return $this->pingback_error( 32, __( 'We cannot find a title on that page.' ) );
+		}
 
 		$remote_source = strip_tags( $remote_source, '<a>' ); // just keep the tag we need
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-alpha-38619';
+$wp_version = '4.7-alpha-38620';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.