Always connect postgres schema if dbname or default_dbname is not provided

lib/Doctrine/DBAL/Driver/PDOPgSql/Driver.php

@@ -93,8 +93,9 @@ class Driver extends AbstractPostgreSQLDriver
         } else {
             // Used for temporary connections to allow operations like dropping the database currently connected to.
             // Connecting without an explicit database does not work, therefore "postgres" database is used
-            // as it is certainly present in every server setup.
+            // as it is mostly present in every server setup.
             $dsn .= 'dbname=postgres' . ' ';
+        }
 
         if (isset($params['sslmode'])) {
             $dsn .= 'sslmode=' . $params['sslmode'] . ' ';