code: func (s *Series) GetDisplayNameOk() (string, bool) {
  	if s == nil || s.DisplayName == nil {
  		return "", false
  	}
  	return *s.DisplayName, true
  }
docs: // GetDisplayNameOk returns a tuple with the DisplayName field if it's non-nil, zero value otherwise
  // and a boolean to check if the value has been set.