@Override
    public final CompletableFuture<Endpoint> select(ClientRequestContext ctx,
                                                    ScheduledExecutorService executor) {
        return maybeCreateSelector().select(ctx, executor);
    }
Returns whether this {@link EndpointGroup} allows an empty {@link Endpoint} list.
core/src/main/java/com/linecorp/armeria/client/endpoint/DynamicEndpointGroup.java