Do not append single '&' with empty query parameters

public class Reproducer {

    @Path("someResource")
    @Produces(MediaType.APPLICATION_JSON)
    @Consumes(MediaType.APPLICATION_JSON)
    public interface SomeResource {

        @GET
        void methodWIthList(@QueryParam("listA") List<String> listA, @QueryParam("listB") List<String> listB);
    }

    public static void main(String[] args) {
        ResteasyClientBuilder builder = (ResteasyClientBuilder) ClientBuilder.newBuilder();
        builder.httpEngine(new ClientHttpEngine() {

            @Override
            public Response invoke(Invocation request) {
                System.out.println(((ClientInvocation) request).getUri());

                // http://www.something.org/someResource?&

                return new AbortedResponse(null, new ServerResponse());
            }

            @Override
            public SSLContext getSslContext() {
                return null;
            }

            @Override
            public HostnameVerifier getHostnameVerifier() {
                return null;
            }

            @Override
            public void close() {}
        }).build().target("http://www.something.org").proxy(SomeResource.class).methodWIthList(List.of(), List.of());
    }
}