* When trying to create an artist entry for a non-artist tag, set the
error on the name attribute so that the artist name gets marked
as incorrect in the artist edit form.
* Fix a bad `Name '' cannot be blank` error message when the artist name
is blank.
* Fix showing wiki pages of non-artist tags in the artist edit form when
the artist name conflicts with a non-artist tag (e.g. if you try to
create an artist named '1girl', don't show the wiki for 1girl in the
artist edit form).
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