Add a badge to the photo list items that have multiple photos in them

layouts/photos/li_thumbnail_in_grid.html

@@ -1,6 +1,11 @@
 {{- $thumbnail := partial "photos/thumbnail.html" (dict "Page" . "Width" 600 "Height" 600) -}}
 {{- $thumbnail = $thumbnail.Crop "600x600" -}}
 {{- $altText := $thumbnail.Params.alt -}}
+{{- $numberOfImages := len (partial "photos/list.html" .) -}}
+{{- $hasMultipleImages := gt $numberOfImages 1 -}}
 <a href="{{ .RelPermalink }}" title="{{ .Title }}">
+  {{ if $hasMultipleImages }}
+  <div class="badge">{{ $numberOfImages }}</div> 
+  {{ end }}
   <img src="{{ $thumbnail.RelPermalink }}"{{ with $altText }} alt="{{ . }}"{{ end }}>
 </a>