Description:
------------
> PHP 5.3.8 (on both Ubuntu Linux and Windows 7)
> ./configure --with-pdo-mysql
> No changes to php.ini

When fetching rows from a MySQL database using PDO with the default fetch method 
FETCH_LAZY, the empty() function returns false on NULL values in the database. 
This behavior does not exist when using other fetch methods (such as FETCH_OBJ or 
FETCH_ASSOC).

Test script:
---------------
$row = $stmt->fetch(PDO::FETCH_LAZY);

echo $row->Address2."\n";             // RIGHT: outputs ''
var_dump($row->Address2);             // RIGHT: outputs 'NULL'
var_dump(!$row->Address2);            // RIGHT: outputs 'bool(true)'
var_dump(!!$row->Address2);           // RIGHT: outputs 'bool(false)'

echo empty($row->Address2)."\n";      // WRONG: outputs ''
var_dump(empty($row->Address2));      // WRONG: outputs 'bool(false)'
var_dump(empty($row['Address2']));    // WRONG: outputs 'bool(false)'

$var = $row['Address2'];
var_dump($var);                       // RIGHT: outputs 'NULL'
var_dump(empty($var));                // RIGHT: outputs 'bool(true)'

Expected result:
----------------
NULL
bool(true)
bool(false)
1
bool(true)
bool(true)
NULL
bool(true)

Actual result:
--------------
NULL
bool(true)
bool(false)

bool(false)
bool(false)
NULL
bool(true)