Description:
------------
Using PDO with mysqlnd driver.

PDO instance was asked to throw exceptions, but calling fetch() after the TCP connection broke does not throw an exception, it just emits a warning instead, "Empty row packet body".

The server is located on a different computer on the network, cannot use unix socket to reach it.

Test script:
---------------
$conn = new PDO(
            'mysql:host=192.168.1.2;dbname=somedb;charset=utf8',
            'somedbuser',
            'somedbpass',
            array(
                PDO::ATTR_PERSISTENT => false,
                PDO::ATTR_EMULATE_PREPARES => false,
                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_STRINGIFY_FETCHES => false,
                PDO::ATTR_AUTOCOMMIT => true,
                PDO::MYSQL_ATTR_INIT_COMMAND => "SET time_zone = '+00:00'",
                PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => false,
                PDO::MYSQL_ATTR_DIRECT_QUERY => false,
                PDO::MYSQL_ATTR_FOUND_ROWS => false,
            )
        );

        $res = $conn->query("
            any query which gives back a lot of rows
        ");
        while($row = $res->fetch(PDO::FETCH_ASSOC)){
            //during this loop runs, terminate the connection with something, like iptables
            var_export($row);
        }
        var_export($row);


Expected result:
----------------
PDOStatement::fetch() should throw an exception as the server connection has gone away (trying to do a new PDO::query() after does throw an exception with that error message).

Actual result:
--------------
The script above just emits a warning and finishes the loop returning false the very same way as if there were no more rows left from the query.