set #empty_option of billing address select list I'm using Drupal 7 with Commerce (7.1) Commerce Address Book 7.x-2.0

I'm simply trying to change the #empty_option value of the "Addresses on file" select boxes that appear on the checkout page from "-- Choose --" to "Add new address"  I'm using hook form alter and then:

if ($form['#id'] == 'commerce-checkout-form-checkout'){
    $form['customer_profile_shipping']['addressbook']['#empty_option'] = (t -'- Add a new billing address -');
}


But when the page loads, it still shows "--Choose --"

I'm pretty sure this should be easy !
The problem is that your t() function looks like this:

(t -'- Add a new billing address -');


And it is supposed to look like this:

t('- Add a new billing address -');