#262 added working eureka sample (#333)

src/Ocelot/LoadBalancer/LoadBalancers/NoLoadBalancer.cs

@@ -18,6 +18,11 @@ namespace Ocelot.LoadBalancer.LoadBalancers
         public async Task<Response<ServiceHostAndPort>> Lease()
         {
             //todo no point spinning a task up here, also first or default could be null..
+            if (_services == null || _services.Count == 0)
+            {
+                return new ErrorResponse<ServiceHostAndPort>(new ServicesAreEmptyError("There were no services in NoLoadBalancer"));
+            }
+
             var service = await Task.FromResult(_services.FirstOrDefault());
             return new OkResponse<ServiceHostAndPort>(service.HostAndPort);
         }