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This adds an `! empty()` check for classnames and declarations to avoid calling array_merge() with an empty value. Props mukesh27, ramonopoly, aaronrobertshaw. Fixes #62317. Built from https://develop.svn.wordpress.org/trunk@59442 git-svn-id: http://core.svn.wordpress.org/trunk@58828 1a063a9b-81f0-0310-95a4-ce76da25c4cd