Issue found!

{{ $model := .model }}

{{ range  $piece := .model.Pieces }}
	<div>
		Piece!

		{{ if gt (len $piece.IssueRefs) 1 }}
			{{ len $piece.IssueRefs }} Teile
			<ol>
			{{ range $issue := $piece.IssueRefs }}
				<li>
					<a href="/{{- $issue.Datum -}}/{{- $issue.Nr -}}" >
						{{- $issue.Datum }} Nr. {{ $issue.Nr -}}
					</a>
				</li>
			{{ end }}
			</ol>
		{{ end }}

		{{ range $agentref := $piece.AgentRefs }}
			{{ $agent := GetAgent $agentref.Ref }}
			{{ if gt (len $agent.Names) 0 }}
				{{ index $agent.Names 0 }}
			{{ end }}
			{{ if (or (eq $agentref.Category "") (eq $agentref.Category "autor")) }}
				<span>Author</span>
			{{ end }}
		{{ end }}

	</div>
{{ end }}