Widgets: Prevent fatal error due to calling undefined `wp_json_encode()` when requesting the `load-scripts.php` endpoint.

Props Otto42.
Amends [41352].
Fixes #41610.

Built from https://develop.svn.wordpress.org/trunk@41360


git-svn-id: http://core.svn.wordpress.org/trunk@41193 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/script-loader.php

@@ -672,7 +672,7 @@ function wp_default_scripts( &$scripts ) {
 		$scripts->add( 'admin-gallery', "/wp-admin/js/gallery$suffix.js", array( 'jquery-ui-sortable' ) );
 
 		$scripts->add( 'admin-widgets', "/wp-admin/js/widgets$suffix.js", array( 'jquery-ui-sortable', 'jquery-ui-draggable', 'jquery-ui-droppable' ), false, 1 );
-		$scripts->add_inline_script( 'admin-widgets', sprintf( 'wpWidgets.l10n = %s;', wp_json_encode( array(
+		did_action( 'init' ) && $scripts->add_inline_script( 'admin-widgets', sprintf( 'wpWidgets.l10n = %s;', wp_json_encode( array(
 			'save' => __( 'Save' ),
 			'saved' => __( 'Saved' ),
 			'saveAlert' => __( 'The changes you made will be lost if you navigate away from this page.' ),

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-alpha-41359';
+$wp_version = '4.9-alpha-41360';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.