Use a wrapper around addressfield_default_values() as the Entity API auto creation callback

Hello,

I have run into a problem when programatically setting properties on addressfileld:

if ($profile_wrapper = entity_metadata_wrapper('commerce_customer_profile', $profile)) {
  $profile_wrapper->commerce_customer_address->postal_code->set($zipCode);
}

The code above will throw the following warning:

Warning: key() expects parameter 1 to be array, string given in addressfield_default_values() (line 326 of /srv/www/drupal/sites/all/modules/addressfield/addressfield.module).

It appears to be caused by the fact that addressfield_default_values is set as 'auto creation' callback and with the code as above this function is called as:

addressfield_default_values('postal_code')

This function expects it's $available_countries argument to be an array or NULL but in this case it is a string and will ultimately fail at line 326 which prevents from the value to be actually saved:

$default_country = key($available_countries);

I have changed the wrapping if statement to also check with is_array which resolved the problem:

// If the default country is undefined or not in the list of available countries,
// just fallback to the first country in the list.
if (!$default_country || (is_array($available_countries) && !isset($available_countries[$default_country]))) {
  $default_country = key($available_countries);
}