[wp-trac] [WordPress Trac] #34139: Widgets panel missing in Customizer when there is some error

[WordPress Trac]

#34139: Widgets panel missing in Customizer when there is some error
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 Reporter:  pavelevap          |       Owner:
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  General            |     Version:  trunk
 Severity:  normal             |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:
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Comment (by pavelevap):

 You can do whatever to create some Fatal error, for example this (without
 activating WooCommerce):

 `$produkt = new WC_Product( $id );`

 There is expected Fatal error "Class 'WC_Product' not found in \wp-
 content\themes\twentyfifteen\footer.php"

 But everything works in Customizer, all panels are active except "Widgets"
 panel which is not displayed. I did not notice this error and investigated
 why it is not possible to manage Widgets in Customizer.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34139#comment:2>
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