Make sure widgets array version is set. fixes #8339

git-svn-id: http://svn.automattic.com/wordpress/trunk@9888 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/widgets.php

@@ -633,6 +633,8 @@ function wp_get_sidebars_widgets($update = true) {
  * @param array $sidebars_widgets Sidebar widgets and their settings.
  */
 function wp_set_sidebars_widgets( $sidebars_widgets ) {
+	if ( !isset( $sidebars_widgets['array_version'] ) )
+		$sidebars_widgets['array_version'] = 3;
 	update_option( 'sidebars_widgets', $sidebars_widgets );
 }