Boone Gorges c5ab953773 Allow comment query results to be limited to comments with comment_post_ID = 0. ...

Previously, this was not possible due to an overly broad `empty()` check.

Passing `null`, `false`, or `''` to 'post_id', or omitting 'post_id'
altogether, will continue to return comments regardless of `comment_post_ID`,
as before. Passing `0` or `'0'` will limit results to comments with no
associated post.

Props danielbachhuber.
Fixes #35090.
Built from https://develop.svn.wordpress.org/trunk@36381


git-svn-id: http://core.svn.wordpress.org/trunk@36348 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2016-01-22 20:20:25 +00:00

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