Description:
------------
When executing a prepared statement in non-emulated mode PDO reports an error, but only with the code without the actual error message text. 

Test script:
---------------
<?php

$pdo = new \PDO("mysql:host=localhost;dbname=test;charset=utf8mb4", 'user', 'password', [
    \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
    \PDO::ATTR_EMULATE_PREPARES => false
]);

$sql = "SELECT `foo` FROM `bar`  WHERE `foo` = :par";
$stmt = $pdo->prepare($sql);
$stmt->execute();
$data = $stmt->fetchAll(PDO::FETCH_ASSOC);

Expected result:
----------------
Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 2031 No data supplied for parameters in prepared statement in

Actual result:
--------------
Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 2031  in

// Notice the text is missing between error code and the "in"