Use `reset()` to grab the first taxonomy in an array, not by numerical index. Cleans up whitespace. Props webord, nbachiyski. Fixes #23506. 

Built from https://develop.svn.wordpress.org/trunk@25108


git-svn-id: https://core.svn.wordpress.org/trunk@25090 1a063a9b-81f0-0310-95a4-ce76da25c4cd