The allowed_themes rolling upgrade for individual sites should not add empty...

The allowed_themes rolling upgrade for individual sites should not add empty allowedthemes arrays. If there are no allowed themes, don't add an empty option. Move the network rolling upgrade to upgrade_network(). see #20146.



git-svn-id: https://core.svn.wordpress.org/trunk@20148 1a063a9b-81f0-0310-95a4-ce76da25c4cd