FIX. missing varibale declaration

src/core/js/ext_bottom_line.js

@@ -84,9 +84,9 @@ var ext_bottom_line = function ($, logger, is_in_view_port, load_config, getEnti
      *     extensionss.
      */
     const _path_has_file_extension = function (entity, extensions) {
-        var path = getEntityPath(entity);
+        const path = getEntityPath(entity);
         if (path) {
-            for (ext in extensions) {
+            for (var ext in extensions) {
                 if(path.toLowerCase().endsWith(ext)) {
                     return true;
                 }