[wp-trac] [WordPress Trac] #56291: Theme JSON: Fix notice when unknown elements are specified

[WordPress Trac]

#56291: Theme JSON: Fix notice when unknown elements are specified
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 Reporter:  scruffian     |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 If a theme.json file specifies an unknown element then we'll get a notice
 from line 1482 in this file. This adds an array_key_exists check before we
 get the value of the array at that key, to avoid the notice.

 Gutenberg issue: WordPress/gutenberg#42649
 GitHub PR: https://github.com/WordPress/wordpress-develop/pull/3026

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Ticket URL: <https://core.trac.wordpress.org/ticket/56291>
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