From 2ca15d1e5ce70493c5c0c096ca0c76503d6da07c Mon Sep 17 00:00:00 2001
From: Jonathan Desrosiers <desrosj@git.wordpress.org>
Date: Thu, 29 Oct 2020 18:03:35 +0000
Subject: [PATCH] Upgrade/install: Improve logic check when determining
 installation status.

Improve handling of ambiguous return values to determine if a blog is installed.

Props zieladam, xknown.
Merges [49377] to trunk.

git-svn-id: https://develop.svn.wordpress.org/trunk@49386 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/functions.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index 537425d8981a..3d0412630e1c 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -1756,7 +1756,8 @@ function is_blog_installed() {
 			continue;
 		}
 
-		if ( ! $wpdb->get_results( "DESCRIBE $table;" ) ) {
+		$described_table = $wpdb->get_results( "DESCRIBE $table;" );
+		if ( is_array( $described_table ) && count( $described_table ) === 0 ) {
 			continue;
 		}