[wp-trac] [WordPress Trac] #17939: Adding an existing category via the category meta box on the post edit screen fails

[WordPress Trac]

#17939: Adding an existing category via the category meta box on the post edit
screen fails
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 Reporter:  mdawaffe      |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:
 Severity:  normal        |   Keywords:
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 To reproduce:
 1. Create a post category called "test".
 2. Go to post-new.php
 3. In the category meta box, click "+ Add New Category"
 4. Type "test" into the textbox and click "Add New Category"
 5. Watch "Uncategorized" get added to the list.  Look at the AJAX response
 and see that checkbox's category ID is "Array".

 {{{term_exists()}}} can return an array or an ID.  Attached checks for
 arrayness.

 Caused by [12798]

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Ticket URL: <http://core.trac.wordpress.org/ticket/17939>
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