Fixed admin preview display

in file uc_multiprice.module, in function uc_multiprice_price_handler_alter, I changed

function uc_multiprice_price_handler_alter(&$price, &$context, &$options) {
  $cid = uc_multiprice_country_id();

to

function uc_multiprice_price_handler_alter(&$price, &$context, &$options) {
  if($options['country_id'])
    $cid = $options['country_id'];
  else
    $cid = uc_multiprice_country_id();