@CheckForNull
    @Override
    public CNode describe(Unsecured instance, ConfigurationContext context) {
        return null; // FIXME
    }
Handles {@link AuthorizationStrategy.Unsecured} that requires a special treatment due to its singleton semantics.

@author Kohsuke Kawaguchi
plugin/src/main/java/io/jenkins/plugins/casc/core/UnsecuredAuthorizationStrategyConfigurator.java