fix(stack/k8s): add log message

api/http/handler/stacks/stack_delete.go

@@ -247,7 +247,7 @@ func (handler *Handler) deleteStack(userID portainer.UserID, stack *portainer.St
 		out, err := handler.KubernetesDeployer.Remove(userID, endpoint, manifestFiles, stack.Namespace)
 		if err != nil {
 			for _, manifest := range manifestFiles {
-				if exists, err := filesystem.FileExists(manifest); err != nil && !exists {
+				if exists, err := filesystem.FileExists(manifest); err != nil || !exists {
 					// If removal has failed and one of the manifest files is missing,
 					// we can consider this stack as removed
 					return nil