Joe McGill 682ec35fbc Media: Ensure 'media_handle_upload()' returns 'WP_Error' on failure.
This fixes an issue where failures when inserting the attachment post via
`wp_insert_attachment()` would result in a return value of `0` instead of a
`WP_Error` object, as documented. This is addressed by passing `true` as the 
fourth param (added in WP 4.7.0) when calling `wp_insert_attachment()`.

Props mrasharirfan, flixos90.
Fixes #41726.

Built from https://develop.svn.wordpress.org/trunk@41323


git-svn-id: http://core.svn.wordpress.org/trunk@41154 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2017-08-30 15:04:48 +00:00
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