Description:
------------
When an empty VT_ARRAY (i.e. a VT_ARRAY without any elements) is
traversed via foreach, a com_exception ("index out of bounds") is
thrown, what does not match the usual semantics of traversing
empty collections.


Test script:
---------------
<?php
$v = new variant([], VT_ARRAY);
foreach ($v as $el) {
    var_dump($el);
}
echo "done\n";
?>


Expected result:
----------------
done


Actual result:
--------------
Fatal error: Uncaught com_exception: index out of bounds in C:\php-sdk\phpdev\vc15\x64\com.php:3
Stack trace:
#0 {main}
  thrown in C:\php-sdk\phpdev\vc15\x64\com.php on line 3