Helm fails to render pixie-operator-chart templates

[sturman]

Describe the bug
Helm fails to render templates for 'pixie-operator/pixie-operator-chart' chart.

Error: template: pixie-operator-chart/templates/00_olm.yaml:1:113: executing "pixie-operator-chart/templates/00_olm.yaml" at <len (lookup "operators.coreos.com/v1" "OperatorGroup" "" "").items>: error calling len: len of nil pointer

Use --debug flag to render out invalid YAML

To Reproduce
Steps to reproduce the behavior:

1. Runhelm repo add pixie-operator https://pixie-operator-charts.storage.googleapis.com
2. Run helm template pixie-operator pixie-operator/pixie-operator-chart

Expected behavior
Templates (Namespace, ClusterRole, ClusterRoleBinding, Deployment etc) should be rendered

App information (please complete the following information):

• Helm version: version.BuildInfo{Version:"v3.8.2", GitCommit:"6e3701edea09e5d55a8ca2aae03a68917630e91b", GitTreeState:"clean", GoVersion:"go1.17.5"}
• Helm chart: pixie-operator-chart
• Helm chart version: 0.0.24
• K8s cluster version: 1.21
• ArgoCD: 2.3.3

Additional context
After commit 8dec8ee is pushed and released, the helm function lookup is invoked in order to check if k8s cluster has "operators.coreos.com/v1" "OperatorGroup" resources. When running helm template the lookup is not supported.

Keep in mind that Helm is not supposed to contact the Kubernetes API Server during a helm template or a helm install|update|delete|rollback --dry-run, so the lookup function will return an empty list (i.e. dict) in such a case.

When trying to install pixie-operator-chart with ArgoCD it fails because ArgoCD executes helm template before installing the chart.

The ArgoCD issue that could be related to this argoproj/argo-cd#5202

Anyway, the helm fails to template the chart pixie-operator-chart locally.