[FIX] correctly show import errors from detect_data

wrong class was removed from wrong element

bzr revid: xmo@openerp.com-20120831114137-da4hzgjeooiwbwkq

addons/web/static/src/js/data_import.js

@@ -205,7 +205,7 @@ openerp.web.DataImport = openerp.web.Dialog.extend({
         if (results['error']) {
             result_node.append(QWeb.render('ImportView.error', {
                 'error': results['error']}));
-            this.$element.find('fieldset').removeClass('oe-closed');
+            this.$element.find('form').removeClass('oe-import-no-result');
             return;
         }
         if (results['success']) {