[wp-trac] [WordPress Trac] #27780: Widget Customizer: Before and after widget check!

[WordPress Trac]

#27780: Widget Customizer: Before and after widget check!
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 Reporter:  jetonr        |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Widgets       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Do a check for before and after if they are set because themes with
 registered sidebars where before_widget and after_widget is empty ""
 causes
 Uncaught TypeError: Cannot read property 'replace' of undefined from
 customize-preview-widgets.min.js?ver=3.9-RC1:1

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Ticket URL: <https://core.trac.wordpress.org/ticket/27780>
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