Small fixes clusters

src/main/java/net/geant/nmaas/externalservices/kubernetes/RemoteClusterManager.java

@@ -37,8 +37,8 @@ import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.time.OffsetDateTime;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.HashMap;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
@@ -46,8 +46,8 @@ import java.util.Optional;
 import java.util.stream.Collectors;
 
 @Service
-@RequiredArgsConstructor
 @Slf4j
+@RequiredArgsConstructor
 public class RemoteClusterManager implements ClusterMonitoringService {
 
     private final KClusterRepository clusterRepository;
@@ -137,11 +137,11 @@ public class RemoteClusterManager implements ClusterMonitoringService {
                                 .state(KClusterState.UNKNOWN)
                                 .contactEmail(view.getContactEmail())
                                 .currentStateSince(OffsetDateTime.now())
-                                .domains(view.getDomainNames().stream().map(d -> {
+                                .domains(!view.getDomainNames().isEmpty() ?  view.getDomainNames().stream().map(d -> {
                                             Optional<Domain> dom = domainService.findDomain(d);
                                             return dom.orElse(null);
                                         }
-                                ).toList())
+                                ).toList() : Collections.emptyList())
                                 .build(),
                         file);