Does not work for charts with image tags that default to Chart.AppVersion

[petewall]

I'm seeing more and more Helm charts that leave the tag field empty in favor of defaulting to the AppVersion field of the chart.

A few examples:

• Grafana Agent

image:
  # -- Grafana Agent image registry (defaults to docker.io)
  registry: "docker.io"
  # -- Grafana Agent image repository.
  repository: grafana/agent
  # -- (string) Grafana Agent image tag. When empty, the Chart's appVersion is
  # used.
  tag: null

• Kube State Metrics
• Node Exporter

When I run relok8s with the following hints file (I'm using Grafana Agent as a subchart):

---
- "{{ .grafana-agent.image.registry }}/{{ .grafana-agent.image.repository }}:{{ .grafana-agent.image.tag }}"

I get this result:

% relok8s chart move -i hints.yaml --registry registry.exampke.com mychart.tgz
Chart provided
Computing relocation...

Error: failed to pull original images: failed to parse image reference: could not parse reference: docker.io/grafana/agent:<no value>