lookup nil map access #95
Description
While debugging an issue reported in Kubernetes' Slack a minimal reproduction of the bug was achieved by
cat <<EOF > templates/test.yaml
{{- lookup "machineconfig" "" "v1alpha1" | toYaml }}
EOF
rm templates/{controlplane,worker}.yaml
talm template n 192.168.121.21 -e 192.168.121.21 -t templates/test.yaml > /dev/stdout
which results in
failed to render templates: template: cluster/templates/test.yaml:1:4: executing "cluster/templates/test.yaml" at <lookup "machineconfig" "" "v1alpha1">: error calling lookup: assignment to entry in nil map
This narrows down the issue to a bug in the implementation of lookup in Talm.