I am trying to generate a template from helm chart and want to save the result into a file:

helm template dashboard -n dev --set image.tag=0.1.0 ./dashboard > ./test.yml  

but I've got an empty file.

Runnning without to put the result into the file:

helm template dashboard -n dev --set image.tag=0.1.0 ./dashboard   

---
# Source: dashboard/templates/service.yaml
apiVersion: v1
kind: Service
metadata:
  name: dashboard
  labels:
    helm.sh/chart: dashboard-0.1.0
    app.kubernetes.io/name: dashboard
    app.kubernetes.io/instance: dashboard
    app.kubernetes.io/version: "1.17.5"
    app.kubernetes.io/managed-by: Helm
spec:

As you can see, it generates the output.

What am I doing wrong?