Jacorb :migrate operation does not return migration-warnings

If I run migrate operation on jacorb subsystem the result of the operation is

/subsystem=jacorg:migrate()
{
    "outcome" => "success",
    "result" => undefined
}

But the result should be

{
    "outcome" => "success",
    "result" => {"migration-warnings" => []}
}

Try the same with messaging or web subsystem

/subsystem=web:migrate()
{
    "outcome" => "success",
    "result" => {"migration-warnings" => []}

To reproduce

• compile latest wildfly from github
• use the attached file standalone-full.tomig.inital.xml
• ./bin/standalone.sh -c standalone-full.tomig.initial.xml --admin-only
• ./bin/jboss-cli.sh -c --controller=remote://localhost:9999
• /subsystem=jacorb:migrate()