Don't display Edit links for posts and terms in toolbar if they are empty.

props boonebgorges.
fixes #29538.
Built from https://develop.svn.wordpress.org/trunk@29714


git-svn-id: http://core.svn.wordpress.org/trunk@29488 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Check for [\r\n\t ] instead of \s in sanitize_file_name() to avoid UTF-8 issues.

props p_enrique.
fixes #26094.
Built from https://develop.svn.wordpress.org/trunk@29715


git-svn-id: http://core.svn.wordpress.org/trunk@29489 1a063a9b-81f0-0310-95a4-ce76da25c4cd