[wp-trac] [WordPress Trac] #42442: Install & Preview of themes doesn't work.

[WordPress Trac]

#42442: Install & Preview of themes doesn't work.
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 Reporter:  atachibana               |       Owner:  westonruter
     Type:  defect (bug)             |      Status:  assigned
 Priority:  normal                   |   Milestone:  4.9
Component:  Customize                |     Version:  trunk
 Severity:  normal                   |  Resolution:
 Keywords:  has-patch needs-testing  |     Focuses:  javascript
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Comment (by westonruter):

 I've never been able to reproduce the issue the issue with the PHP notice.
 I have been able to reproduce the issue with the installation buttons, and
 [attachment:42442.1.diff] fixes it for me.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42442#comment:11>
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