Index: src/wp-includes/functions.php
===================================================================
--- src/wp-includes/functions.php	(revision 37473)
+++ src/wp-includes/functions.php	(working copy)
@@ -2659,7 +2659,11 @@
 <head>
 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 	<meta name="viewport" content="width=device-width">
-	<?php wp_no_robots(); ?>
+	<?php
+	if ( function_exists( 'wp_no_robots' ) ) {
+		wp_no_robots();
+	}
+	?>
 	<title><?php echo $title ?></title>
 	<style type="text/css">
 		html {