Fix api error return handling in yemi

public/js/yemi.js

@@ -100,6 +100,8 @@ var doAjax = function (url, data, pre, post, onSuccess, onFailure, suppressError
             ajaxGoing = false;
         })
         .fail(function (jqXHR, textStatus) {
+            hideMask();
+            toastr.error('Unable to process');
             if (onHttpFailure) {
                 onHttpFailure(textStatus);
             }