code: def check_dashboard_cookie(self):
          
          # Getting cookie
          cookie_raw = self.request.get(DASHBOARD_FILTER_COOKIE, None)
          # If it doesn't exist, create it with default values
          if cookie_raw is None:
              cookie_raw = self._create_raw_data()
              self.request.response.setCookie(
                  DASHBOARD_FILTER_COOKIE,
                  json.dumps(cookie_raw),
                  quoted=False,
                  path='/')
              return cookie_raw
          return get_strings(json.loads(cookie_raw))
docs: Check if the dashboard cookie should exist through bikasetup
          configuration.
  
          If it should exist but doesn't exist yet, the function creates it
          with all values as default.
          If it should exist and already exists, it returns the value.
          Otherwise, the function returns None.
  
          :return: a dictionary of strings