Merge pull request #23760 from owncloud/fix-setup-mysql

Fix conditional check in MySQL setup

lib/private/setup/mysql.php

@@ -43,7 +43,7 @@ class MySQL extends AbstractDatabase {
 		$query='select count(*) from information_schema.tables where table_schema=? AND table_name = ?';
 		$result = $connection->executeQuery($query, [$this->dbName, $this->tablePrefix.'users']);
 		$row = $result->fetch();
-		if(!$result or $row[0]==0) {
+		if (!$row or $row['count(*)'] === '0') {
 			\OC_DB::createDbFromStructure($this->dbDefinitionFile);
 		}
 	}