{{- $section := default (.Get 0) (.Get "section") -}}
{{- $key := default (.Get 1) (.Get "key") -}}
{{- $value := index $.Site.Data.values $section $key -}}
{{- if not $section }}
{{- errorf "missing parameter 'section': %s" .Position }}
{{- end }}
{{- if not $key }}
{{- errorf "missing parameter 'key': %s" .Position }}
{{- end }}
{{- if not $value }}
{{- errorf "missing, empty or null value at 'values/%s.%s': %s" $section $key .Position }}
{{- end }}
{{- $value -}}
