Bug in Test S3 Upload

The ajax post for test s3 upload has incorrect order to test key “domain” on $config var:

File: plugins/w3-total-cache/lib/W3/AdminActions/CdnActionsAdmin.php
Line: 380

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

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

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