fix #5818 allow using helmChart without repo URL.

[aarnaud]

This fix allows using the Helm Chart with the Chart in the repo. the regression was introduced by #4999

That I don't know why require a repo to use the version.

So this fix allows us to use multiple versions of charts that are stored in the chartHome:

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

helmGlobals:
  chartHome: mycharts

helmCharts:
  - name: harbor
    releaseName: harbor
    version: 1.16.0

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