[-] BO : fixed bug on change currency feature in order page when we have only one currency

git-svn-id: http://dev.prestashop.com/svn/v1/branches/1.5.x@11817 b9a71923-0436-4b27-9f14-aed3839534dd

admin-dev/themes/template/orders/view.tpl

@@ -204,7 +204,7 @@
 			<fieldset>
 				<legend><img src="../img/admin/money.gif" /> {l s='Payment'}</legend>
 
-				{if !$order->valid}
+				{if (!$order->valid && sizeof($currencies) > 1)}
 				<form method="post" action="{$currentIndex}&viewOrder&id_order={$smarty.get.id_order|escape:'htmlall':'UTF-8'}&token={$smarty.get.token|escape:'htmlall':'UTF-8'}">
 					<p class="warn">{l s='Don\'t forget to update your conversion rate before make this change.'}</p>
 					<label>{l s='Change order\'s currency to:'}</label>