The UI for adding a site says that title is required, however the actual code wasn't requiring it. Props ideag. Fixes #54012. git-svn-id: https://develop.svn.wordpress.org/trunk@55894 602fd350-edb4-49c9-b593-d223f7449a82
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wp-admin/network/users.php
wp-admin/network/sites.php
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/documentation/