Impossible to connect to OpenShift when landrush is enabled (instead of xip.io)

When landrush is enabled on the CDK, the Docker registry url is https://hub.openshift.openshift.cdk, it's stored in the OpenShift connection properties when launching the CDK server adapter.

However, URL validation fails on that url, thus preventing the Connection wizard to finish, because *.cdk urls are not valid. Indeed cdk is not a known/valid TLD, according to Apache's commons UrlValidator