Andrew Nacin 3a108f5bce Media Grid: Don't attempt to delete an attachment that can't be deleted.
Merges [29755] to the 4.0 branch.

props wonderboymusic.
fixes #29597.

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git-svn-id: http://core.svn.wordpress.org/branches/4.0@30404 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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