jorgefilipecosta 95bbd4c7d1 Global Styles: Fix PHP warning in WP_REST_Global_Styles_Controller if no styles exist.
There is a PHP warning in WP_REST_Global_Styles_Controller because we are assuming that every theme.json has styles property, which is not always the case.

Props ntsekouras.
Fixes #54900.
Built from https://develop.svn.wordpress.org/trunk@52750


git-svn-id: http://core.svn.wordpress.org/trunk@52339 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2022-02-17 13:47:59 +00:00
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