Partially revert [15642]. Fixes Bulk deletion of non-media items. As a bonus,...

Partially revert [15642]. Fixes Bulk deletion of non-media items. As a bonus, exit on redirects & check the post status is valid before querying it. See #14579

git-svn-id: https://core.svn.wordpress.org/trunk@15667 1a063a9b-81f0-0310-95a4-ce76da25c4cd