57483 differentiate between failed and zero-results call to get_row() #4574
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This PR utilises the fact that
$wpdb->get_row()will return anullwhen no entries were found vsfalsewhen it experienced an error. Anullresult is still cached (site/network does not exist), while afalseone (query failed) is not.Trac ticket: https://core.trac.wordpress.org/ticket/57483
This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.