Description:
------------
Running PDO::lastInsertId() using a bad sequence name (not updated or nonexistent) no longer throws an exception after upgrading.

PostgreSQL server version is 9.5.5.

It works in 7.0.8-0ubuntu0.16.04.3, but fails in both 7.0.13-0ubuntu0.16.04.1 and 7.0.14-2+deb.sury.org~xenial+1.
 


Test script:
---------------
$pdo = new PDO(
    'pgsql:service=...', null, null,
    array(
        PDO::ATTR_PERSISTENT => false,
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
        PDO::PGSQL_ATTR_DISABLE_PREPARES => true
    )
);

try {
    $pdo->lastInsertId('nonexistent_seq');
    echo "Error: No exception thrown";
} catch (PDOException $e) {
    echo "Success: Exception thrown";
}


Expected result:
----------------
Success: Exception thrown

Actual result:
--------------
Error: No exception thrown