Ensure we have a charset before calling mb_internal_encoding(), avoiding an unnecessary (if suppressed) warning. props dfavor. fixes #23093.



git-svn-id: https://core.svn.wordpress.org/trunk@23373 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Return WP_Error from wp_crop_image() if saving has failed. props macbrink. fixes #23325.

git-svn-id: https://core.svn.wordpress.org/trunk@23374 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update Backbone.js to 0.9.10. props aaronholbrook, fixes #23262.



git-svn-id: https://core.svn.wordpress.org/trunk@23375 1a063a9b-81f0-0310-95a4-ce76da25c4cd