def valid?
      !base_url.nil? &&
      !secure_base_url.nil? &&
      backdrop_sizes.any? &&
      logo_sizes.any? &&
      poster_sizes.any? &&
      profile_sizes.any? &&
      still_sizes.any?
    end
def valid?
      !base_url.nil? &&
      !secure_base_url.nil? &&
      backdrop_sizes.any? &&
      logo_sizes.any? &&
      poster_sizes.any? &&
      profile_sizes.any? &&
      still_sizes.any?
    end
Returns a boolean indicating whether the Image configurations are valid or not.