show a clear error when trying to use preloaded data not on the web; #3219

tools/file_packager.py

@@ -484,9 +484,11 @@ if has_preloaded:
     var PACKAGE_PATH;
     if (typeof window === 'object') {
       PACKAGE_PATH = window['encodeURIComponent'](window.location.pathname.toString().substring(0, window.location.pathname.toString().lastIndexOf('/')) + '/');
-    } else {
+    } else if (typeof location !== 'undefined') {
       // worker
       PACKAGE_PATH = encodeURIComponent(location.pathname.toString().substring(0, location.pathname.toString().lastIndexOf('/')) + '/');
+    } else {
+      throw 'using preloaded data can only be done on a web page or in a web worker';
     }
     var PACKAGE_NAME = '%s';
     var REMOTE_PACKAGE_BASE = '%s';