Daniel Bachhuber 5773ee93e5 REST API: Don't add fields to object when not included in ?_fields=.
In [43087], we improved REST API performance by only rendering the fields specified in the request. Similarly, any fields registered with `register_rest_field()` should only be rendered when included in `?_fields=`.

Props dlh.
Fixes #45099.


git-svn-id: https://develop.svn.wordpress.org/branches/5.0@43736 602fd350-edb4-49c9-b593-d223f7449a82
2018-10-17 02:40:23 +00:00
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