Handle get request.

def get(self):
    """Handle get request."""
    try:
      app_user = InitUser()

      if (app_user.client_id and app_user.client_secret and
          app_user.adwords_manager_cid and app_user.developer_token and
          app_user.refresh_token):
        self.redirect('/showAccounts')
      else:
        self.redirect('/showCredentials')
    except Exception, e:
      logging.debug(str(e))