Ryan McCue 81ffd2492c REST API: Optimise for singular error instances.
Previously, the API returned a list of errors, as WP_Error can hold multiple
error codes internally. This isn't a particularly common use case, and it
makes handling errors on the client side more complex than it needs to be.

Fixes #34551.

Built from https://develop.svn.wordpress.org/trunk@35653


git-svn-id: http://core.svn.wordpress.org/trunk@35617 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-11-17 04:12:26 +00:00
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