ryan 1835dbf737 Check if empty to avoid noticed when signing up for username in multisite. Props jfarthing84, kawauso. fixes #16680 ...

git-svn-id: http://svn.automattic.com/wordpress/trunk@17794 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2011-05-04 18:38:17 +00:00

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