fix(helm): ignore file-not-found error for `helm repo list -o json`
fix(helm): ignore file-not-found error for `helm repo list -o json`

Currently, `helm repo list -o json` returns (either `[]` or an english
"no repositories" error message, depending on whether
`$HELM_CONFIG_HOME/repositories.yaml` exists). This PR aligns the two cases
so that it always returns `[]`.

Signed-off-by: Teo Klestrup Röijezon <437a1c14efaa8e9881ef6bb077411dc1d24cb4c0@nullable.se>

helm/helm,helm/helm,bacongobbler/helm,bacongobbler/helm