Ticket #25334: 25334.patch

wp-includes/post.php

@@ -2907 +2907 @@
                         if ( $wp_error )
                                 return new WP_Error('invalid_page_template', __('The page template is invalid.'));
                         else
-                                return 0;
+                                $page_template = 'default';
                 }
                 update_post_meta($post_ID, '_wp_page_template',  $page_template);
         }