Tim Beks on "[Plugin: W3 Total Cache] V 0.9.3 CDN Cloudfront Error - Empty Access Key"

I was using 0.9.3 and bumped into this problem. I was using Amazon Cloudfront and when I tried to test the settings it was not working. I changed the following to see that the test has passed in wp-content/plugins/w3-total-cache/lib/W3/AdminActions/CdnActionsAdmin.php

if (!isset($config['host'])) {
    $config = W3_Request::get_string('config');
    $config = json_decode($config, true);
}

$config = array_merge($config, array(
    'debug' => false
));

if (!is_array($config['domain'])) {
   $config['domain'] = explode(',', $config['domain']);
}

To:

if ( 'cf' !== $engine && !isset($config['host'])) {
   $config = W3_Request::get_string('config');
   $config = json_decode($config, true);
}

if( is_array( $config ) ) {
    $config = array_merge($config, array(
         'debug' => false
     ));
}

if ( isset( $config['domain'] ) && ! is_array( $config['domain'] ) ) {
   $config['domain'] = explode(',', $config['domain']);
}

Now the test is working.