Description:
------------
Sqlite3 database named id.sl3 contains an empty table created by this SQL query:
create table id(id INTERGE PRIMARY KEY, txt);

Use PDO prepared statment to query the table. Since the table is empty, no rows will return. execute() method of the PDO statment object will cause: 
   1. Apache to halt if using mod_php
   2. CGI/FastCGI to halt, while Apache still working providing static contents, if using CGI/FastCGI

Reproduce code:
---------------
<?PHP
# make a PDO
$pdo    = new PDO('sqlite:id.sl3');
# select a row that doesn't exist in the table
$stmt   = $pdo->prepare('SELECT * FROM id WHERE id = 1000');
# if no row found, PDO will cause Apache to halt
$stmt->execute();     
?>

Expected result:
----------------
execute() should return empty array. not clear if with output binding. 

Actual result:
--------------
nothing in Apache log file recorded for this.