Description:
------------
PDOStatement::getColumnMeta throws a "column index out of range" error if the result set is empty.

After calling PDOStatement::columnCount to confirm that there are columns in the result set, subsequent call to PDOStatement::getColumnMeta shouldn't produce an error even if its implementation does not enable it to fetch the requested column (because there are no rows).

Test script:
---------------
$pdo = new PDO('sqlite:', null, null, [
	PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
]);
$stmt = $pdo->query('select 1 where 0');
if ($stmt->columnCount())
	var_dump($stmt->getColumnMeta(0));


Expected result:
----------------
array(6) {
  ["native_type"]=>
  string(7) "integer"
  ["flags"]=>
  array(0) {
  }
  ["name"]=>
  string(1) "1"
  ["len"]=>
  int(4294967295)
  ["precision"]=>
  int(0)
  ["pdo_type"]=>
  int(2)
}

Actual result:
--------------
ERROR: SQLSTATE[HY000]: General error: 25 column index out of range