[wp-trac] [WordPress Trac] #54900: PHP warning in `WP_REST_Global_Styles_Controller` if no `styles` exist in theme.json

[WordPress Trac]

#54900: PHP warning in `WP_REST_Global_Styles_Controller` if no `styles` exist in
theme.json
--------------------------+-----------------------------
 Reporter:  ntsekouras    |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:
 Severity:  minor         |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 During this [GB PR](https://github.com/WordPress/gutenberg/pull/38124) I
 noticed a PHP warning in `WP_REST_Global_Styles_Controller` where we are
 assuming that every theme.json has `styles` property, which is not always
 the case.

 It's fixed in GB now, but we should add this to `5.9` next minor release.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54900>
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