static QueueableTicketRegistryMessageReceiver noOp() {
        return command -> {
        };
    }
No op queueable ticket registry message receiver that does nothing.

@return the queueable ticket registry message receiver
core/cas-server-core-tickets-api/src/main/java/org/apereo/cas/ticket/registry/pubsub/queue/QueueableTicketRegistryMessageReceiver.java