message: Add extra log for failing to load variable purpose
diff: @@ -169,6 +169,7 @@ Status RunRestore(const RunOptions& run_options, const string& export_dir,
  const string variables_index_path = io::JoinPath(
  variables_directory, MetaFilename(kSavedModelVariablesFilename));
  if (!Env::Default()->FileExists(variables_index_path).ok()) {
  + LOG(INFO) << "Falied to restore variables from " << variables_index_path;
  LOG(INFO) << "The specified SavedModel has no variables; no checkpoints "
  "were restored.";
  return Status::OK();
  