Boone Gorges 77128eb048 Default $parent in category_exists() should default to null rather than 0.
[29863] made the corresponding change in `term_exists()`. Failure to change the
default value in `category_exists()` meant that an unspecified value for
`$parent` would limit results to top-level categories.

Includes unit tests and corrected function documentation.

Props hissy.
Fixes #30975 for trunk.

git-svn-id: https://develop.svn.wordpress.org/trunk@31140 602fd350-edb4-49c9-b593-d223f7449a82
2015-01-11 01:25:19 +00:00
2014-08-21 02:53:16 +00:00
2014-12-17 17:37:16 +00:00
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