[wp-trac] [WordPress Trac] #23051: Menu with navigation label '0' gets removed

[WordPress Trac]

#23051: Menu with navigation label '0' gets removed
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 Reporter:  zsero                    |       Owner:
     Type:  defect (bug)             |      Status:  new
 Priority:  normal                   |   Milestone:  3.6
Component:  Menus                    |     Version:
 Severity:  normal                   |  Resolution:
 Keywords:  has-patch needs-testing  |
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Comment (by SergeyBiryukov):

 I think we should have `isset()` in some of those checks.

 [attachment:23051.3.diff] also simplifies the logic in
 `wp_update_nav_menu_item()`.

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Ticket URL: <http://core.trac.wordpress.org/ticket/23051#comment:7>
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