Dominik Schilling e7b04993a6 REST API: Fix behavior of sticky posts filter when no posts are sticky.
Previously, when getting posts from the API with `sticky=true`, if there were no sticky posts set, the query would return all posts  as if the `sticky` argument was not set.  In this situation, the query should return an empty array instead.

A `sticky=true` query that should return an empty array (in the previous situation, or with `include` and no intersecting post IDs) was also broken in that it would query the post with ID 1.

Finally, this commit significantly improves test coverage for the `sticky` filter argument, including direct testing of the `WHERE` clauses generated by `WP_Query`.

Merge of [40037] and [40122] to the 4.7 branch.

Props ryelle, jnylen0.
See #39079.
Fixes #39947.
Built from https://develop.svn.wordpress.org/branches/4.7@40136


git-svn-id: http://core.svn.wordpress.org/branches/4.7@40073 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2017-02-27 19:54:39 +00:00
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