K. Adam White 49d8c2590c REST API: Avoid undefined-property notice when setting parent term to 0.
Only try to access `term_id` once `$parent_term` is known to be a `WP_Term`.

Props dlh, earnjam.
Fixes #44983.


git-svn-id: https://develop.svn.wordpress.org/trunk@44965 602fd350-edb4-49c9-b593-d223f7449a82
2019-03-21 18:58:50 +00:00
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