Customize: Run a partial's fallback behavior (full refresh) when selective refresh fails due to a script error.

This ensures that 3rd-party scripts that users paste into Text widgets will gracefully recover and result in the expected preview.

See #27355.
Fixes #40658.

Built from https://develop.svn.wordpress.org/trunk@40771


git-svn-id: http://core.svn.wordpress.org/trunk@40629 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/customize-selective-refresh.js

@@ -457,6 +457,7 @@ wp.customize.selectiveRefresh = ( function( $, api ) {
 				if ( 'undefined' !== typeof console && console.error ) {
 					console.error( partial.id, error );
 				}
+				partial.fallback( error, [ placement ] );
 			}
 			/* jshint ignore:start */
 			document.write = self.orginalDocumentWrite;

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-beta1-40736';
+$wp_version = '4.8-beta1-40771';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.