[wp-trac] [WordPress Trac] #53488: The `action` passed to jQuery.ajax is possibly `null`

[WordPress Trac]

#53488: The `action` passed to jQuery.ajax is possibly `null`
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 Reporter:  ixkaito       |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Widgets       |    Version:
 Severity:  normal        |   Keywords:  has-patch
  Focuses:  javascript    |
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 When I add widgets from the Customizer, the console displays a TypeError
 `action is null`. Need to check if `action` and `action.data` exist.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53488>
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