add default to import error manager

wise-webapp/src/main/webapp/jsp/mindmapImport.jsp

@@ -96,7 +96,8 @@
                     contentType:contentType,
                     statusCode: {
                         201: onSuccess,
-                        400: onError
+                        400: onError,
+                        default: onError
                     }
                 });
         event.preventDefault();