message: [lite] Add check before accessing data from the VarHandleOptions.
diff: @@ -800,7 +800,9 @@ TfLiteStatus ParseOpDataTfLite(const Operator* op, BuiltinOperator op_type,
  params->shared_name = nullptr;
  if (const auto* var_handle_params =
  op->builtin_options_as_VarHandleOptions()) {
  + if (var_handle_params->container())
  params->container = var_handle_params->container()->c_str();
  + if (var_handle_params->shared_name())
  params->shared_name = var_handle_params->shared_name()->c_str();
  }
  *builtin_data = params.release();
  