Dion Hulse 0b813f2544 REST API: Do not error on empty JSON body
It's fairly common for clients to send `Content-Type: application/json` with an
empty body.  While technically not valid JSON, we've historically supported
this behaviour, so it shouldn't cause an error.

Props JPry, jnylen0.
Merges [39594] to the 4.7 branch.
Fixes #39150.

Built from https://develop.svn.wordpress.org/branches/4.7@39609


git-svn-id: http://core.svn.wordpress.org/branches/4.7@39549 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-12-16 05:43:33 +00:00
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