Prevent errors with no data folder

themes/tegakituesday.com/layouts/challenges/single.html

@@ -121,12 +121,14 @@
 {{- define "secondary" -}}
 	{{- $current := replaceRE `[^0-9]` "" .File -}}
 	<div id="submissions">
-		{{- range index .Site.Data.challenges ($current) -}}
-			{{- $submission := . -}}
-			{{- range.images -}}
-				{{- $path := printf "%s" . | printf "%s%s" "/" | printf "%s%s" $current | printf "%s" -}}
-				{{- $image := resources.Get $path -}}
-				{{- partial "submission.html" (dict "submission" $submission "challenge" $current "image" $image) -}}
+		{{- if isset .Site.Data "challenges" -}}
+			{{- range index .Site.Data.challenges ($current) -}}
+				{{- $submission := . -}}
+				{{- range.images -}}
+					{{- $path := printf "%s" . | printf "%s%s" "/" | printf "%s%s" $current | printf "%s" -}}
+					{{- $image := resources.Get $path -}}
+					{{- partial "submission.html" (dict "submission" $submission "challenge" $current "image" $image) -}}
+				{{- end -}}
 			{{- end -}}
 		{{- end -}}
 	</div>