[wp-trac] [WordPress Trac] #24084: Fix possible PHP notices after a user is deleted

[WordPress Trac]

#24084: Fix possible PHP notices after a user is deleted
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 Reporter:  azaozz           |       Type:  defect (bug)
   Status:  new              |   Priority:  normal
Milestone:  Awaiting Review  |  Component:  General
  Version:                   |   Severity:  normal
 Keywords:                   |
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 `get_comment_author()` doesn't check if a user that has commented still
 exists and may throw a notice. Also can return the user_login where a user
 name is expected.

 Same in `edit-form-advanced.php` in the code block that outputs "Last
 edited by ..." under the editor.

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Ticket URL: <http://core.trac.wordpress.org/ticket/24084>
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