Check for None before creating k8s service

get_service() returns None when there are no http-proxy routes,
so we must check before calling create_namespaced_service().

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

stack_orchestrator/deploy/k8s/deploy_k8s.py

@@ -241,7 +241,7 @@ class K8sDeployer(Deployer):
         service = self.cluster_info.get_service()
         if opts.o.debug:
             print(f"Sending this service: {service}")
-        if not opts.o.dry_run:
+        if service and not opts.o.dry_run:
             service_resp = self.core_api.create_namespaced_service(
                 namespace=self.k8s_namespace, body=service
             )