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When resolving theme.json preset variables, add a check to make sure the value is not empty before we run it through strpos() and preg_match_all(). Props ramonopoly, mukesh27, get_dave. Fixes #60613. git-svn-id: https://develop.svn.wordpress.org/trunk@57716 602fd350-edb4-49c9-b593-d223f7449a82