For submitted(drupal_form_submit) using services 3 API not retaining values

I was trying to create comment using Services 3 comment API. But the field I was submitting wasn't retaining the values when it comes to validations. So, I made a small change in drupal_process_form of the form.inc file.

if(!isset($form_state['values'])){
        $form_state['values'] = array();
}