Fix PHP notice on new messages
Merge branch 'master' of git://github.com/Yoast/wordpress-seo into Fix-PHP-notice-new-post
Merge branch 'master' of git://github.com/Yoast/wordpress-seo into Fix-PHP-notice-new-post
Merge branch 'master' of git://github.com/Yoast/wordpress-seo into Fix-PHP-notice-new-post
Merge pull request #934 from jrfnl/Fix-PHP-notice-new-post

Fix PHP notice on new post/page