undefined placeholder for version.js

resources/frontend_client/app/version.js

+// -*- mode: javascript; -*-
+//
+// ************************************************************
+// * WARNING: DO NOT EDIT VERSION.JS DIRECTLY!               *
+// * VERSION.JS IS AUTOMATICALLY GENERATED BY A PERL SCRIPT. *
+// * INSTEAD, EDIT VERSION.JS.TEMPLATE.                      *
+// ************************************************************
+
+'use strict';
+
+var METABASE_VERSION = "[UNDEFINED]"; // this is a placeholder; run ./build_uberjare generate_version_info to add an appropriate value