set Default Product Image, when it is not set yet

FixImages.php

<?php

/*
set Default Product Image, when it is not set yet
*/

if(!isset($argv))
{
    die('only via cli');
    exit;
}

$dir = __DIR__;
chdir($dir); // change to magento dir

ini_set('display_errors', 1);
error_reporting(E_ALL | E_STRICT);

require_once 'app/Mage.php';
umask(0);
Mage::app('admin');


$collection = Mage::getModel('catalog/product')->getCollection()
    ->addAttributeToSelect(array('image', 'small_image', 'thumbnail'))
    ->addAttributeToFilter(
    array(
        array('attribute'=> 'image', 'like' => ''),
        array('attribute'=> 'image', 'null' => true),
        array('attribute'=> 'image', 'like' => 'no_selection'),
        array('attribute'=> 'small_image', 'like' => ''),
        array('attribute'=> 'small_image', 'null' => true),
        array('attribute'=> 'small_image', 'like' => 'no_selection'),
        array('attribute'=> 'thumbnail', 'like' => ''),
        array('attribute'=> 'thumbnail', 'null' => true),
        array('attribute'=> 'thumbnail', 'like' => 'no_selection'),
    )
);

foreach($collection as $_product)
{
    $_product = Mage::getModel('catalog/product')->load($_product->getId());
    $attributesData = array();
    foreach($_product->getMediaGalleryImages() as $_image)
    {
        $attributesData = array(
            'image' => $_image->getData('file'),
            'small_image' => $_image->getData('file'),
            'thumbnail' => $_image->getData('file'),
        );
        Mage::getSingleton('catalog/product_action')
            ->updateAttributes(array($_product->getId()), $attributesData, 0);
        break;
    }
}