Dion Hulse ab103b5bf9 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.
Merges [31140] to the 4.1 branch.
Fixes #30975.

Built from https://develop.svn.wordpress.org/branches/4.1@31376


git-svn-id: http://core.svn.wordpress.org/branches/4.1@31357 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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