In `wp_print_scripts()`, bail if `$handles` is `false` and the `$wp_scripts` global has not been instantiated.

See [31192], #20513.

Built from https://develop.svn.wordpress.org/trunk@31193


git-svn-id: http://core.svn.wordpress.org/trunk@31174 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.wp-scripts.php

@@ -74,9 +74,13 @@ function wp_print_scripts( $handles = false ) {
 
 	wp_scripts_maybe_doing_it_wrong( __FUNCTION__ );
 
-	if ( ! $handles ) {
-		return array(); // No need to instantiate if nothing is there.
+	global $wp_scripts;
+	if ( ! ( $wp_scripts instanceof WP_Scripts ) ) {
+		if ( ! $handles ) {
+			return array(); // No need to instantiate if nothing is there.
+		}
 	}
+
 	return wp_scripts()->do_items( $handles );
 }
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31192';
+$wp_version = '4.2-alpha-31193';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.