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Check the emptiness of the admin email before using `sanitize_email()` and `is_email()` to determine if the address is valid. Fixes #17890 Built from https://develop.svn.wordpress.org/trunk@29877 git-svn-id: http://core.svn.wordpress.org/trunk@29634 1a063a9b-81f0-0310-95a4-ce76da25c4cd