Media Grid, add padding to "No Media Found" message.

Props michalzuber.
See #24716.

Built from https://develop.svn.wordpress.org/trunk@29067


git-svn-id: http://core.svn.wordpress.org/trunk@28853 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid JS errors after [29057].

See #24716.

Built from https://develop.svn.wordpress.org/trunk@29068


git-svn-id: http://core.svn.wordpress.org/trunk@28854 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid JS errors after [29057].

See #24716.

Built from https://develop.svn.wordpress.org/trunk@29069


git-svn-id: http://core.svn.wordpress.org/trunk@28855 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid JS errors after [29057]. When the modal closes, reset the URL.

See #24716.

Built from https://develop.svn.wordpress.org/trunk@29070


git-svn-id: http://core.svn.wordpress.org/trunk@28856 1a063a9b-81f0-0310-95a4-ce76da25c4cd