Ensure that `wp.media.view.settings.post` is set before accessing the post's id

Avoids JS error in cases where media-editor is loaded individually
instead of with the whole `wp_enqueue_media()` process.

fixes #27836. props nacin
Built from https://develop.svn.wordpress.org/trunk@28149


git-svn-id: http://core.svn.wordpress.org/trunk@27980 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/media-editor.js

@@ -535,7 +535,7 @@
 			link: 'post',
 			size: 'thumbnail',
 			order: 'ASC',
-			id: wp.media.view.settings.post.id,
+			id: wp.media.view.settings.post && wp.media.view.settings.post.id,
 			orderby : 'menu_order ID'
 		}
 	});