Twenty Fourteen: Bail early from Featured_Content::hide_featured_term() if term objects are unavailable.

fixes #28072.
Built from https://develop.svn.wordpress.org/trunk@28536


git-svn-id: http://core.svn.wordpress.org/trunk@28362 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix inconsistent header underlining and spacing in background update emails.

fixes #28306.
Built from https://develop.svn.wordpress.org/trunk@28537


git-svn-id: http://core.svn.wordpress.org/trunk@28363 1a063a9b-81f0-0310-95a4-ce76da25c4cd