Post locks: do not check locks on the Posts screen if the list table is empty, see #23697


git-svn-id: http://core.svn.wordpress.org/trunk@24299 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-beta3-24300.

git-svn-id: http://core.svn.wordpress.org/trunk@24300 1a063a9b-81f0-0310-95a4-ce76da25c4cd