Boone Gorges 35ccbc8368 Taxonomy: Eliminate redundant and inaccurate dupe check when creating categories from post.php.
The `term_exists()` check is not needed because of existing dupe
checks in `wp_insert_term()`. Furthermore, `term_exists()` conflates
term names and sanitized slugs, so incorrectly marks terms like
'C' and 'C+' as duplicates of one another.

Props garyc40, SergeyBiryukov, kovshenin, MikeHansenMe.
Fixes #16567.

git-svn-id: https://develop.svn.wordpress.org/trunk@39637 602fd350-edb4-49c9-b593-d223f7449a82
2016-12-23 03:10:36 +00:00
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