Andrea Fercia 4dfb95179a When editing terms, properly display an admin notice-warning when tag_ID is empty.
Also, avoids two related PHP notices when empty or not set (and thus the global `$tag` is a WP_Error object).

Fixes: #34515.

git-svn-id: https://develop.svn.wordpress.org/trunk@35875 602fd350-edb4-49c9-b593-d223f7449a82
2015-12-11 22:48:49 +00:00
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