Sergey Biryukov aa803be1ec Upgrade/Install: Make the check for empty home option in __get_option() more resilient.
This addresses a regression in [47808], where the `home` check expected an empty string to use `siteurl` as a fallback, but `wpdb::get_var()` returns `null` if the option is empty.

Props fjarrett.
Fixes #51011.
Built from https://develop.svn.wordpress.org/trunk@48868


git-svn-id: http://core.svn.wordpress.org/trunk@48630 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-08-26 16:57:16 +00:00
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