fix: return empty instead of error if cache unavailable

Signed-off-by: Peter Jiang <[email protected]>

Author: pjiang-dev

server/application/application.go

@@ -1771,7 +1771,8 @@ func (s *Server) ManagedResources(ctx context.Context, q *application.ResourcesQ
 		return s.cache.GetAppManagedResources(a.InstanceName(s.ns), &items)
 	})
 	if err != nil {
-		return nil, fmt.Errorf("error getting cached app managed resources: %w", err)
+		log.Warnf("Cache unavailable for %s/%s: %v. Returning empty managed resources.", a.Namespace, a.Name, err)
+		return &application.ManagedResourcesResponse{Items: []*v1alpha1.ResourceDiff{}}, nil
 	}
 	res := &application.ManagedResourcesResponse{}
 	for i := range items {