REST API endpoint /wp-json/wp/v2/categories returns 500 instead of 400

[mlf20]

When sending a request to the /wp-json/wp/v2/categories endpoint, it returns a 500 response. Seems like it should return a 400 response code for bad formatting instead of a 500, seeing as no exception is generated and its handled cleanly by the server.

command to reproduce

curl -X POST "​http://[WORDPRESSDOMAIN]/wp-json/wp/v2/categories" -d '{"description": "ZD4ZDAJF", "name": "", "slug": "VZXC6HFM", "parent": 1}' -H 'Authorization: Basic [ACCESSTOKWN]' -H 'Content-Type: application/json'

Server Response

 {"code":"empty_term_name","message":"A name is required for this term.","data":null}

Add http status code to errors earlier they were getting error code 500.

Trac ticket: https://core.trac.wordpress.org/ticket/61843