K. Adam White fe29c9c881 REST API: Return 409 status when attempting to create an existing term.
Fixes an issue where submitting a well-formed request to create a term inappropriately returns a 500 error status if that term already exists.
HTTP 5xx error codes should be reserved for unexpected server errors, so "409 Conflict" is a more appropriate response.

Props alibasheer, guzzilar, shooper.
Fixes #41370.


Built from https://develop.svn.wordpress.org/trunk@41737


git-svn-id: http://core.svn.wordpress.org/trunk@41571 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2017-10-04 16:24:46 +00:00
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