Fix travis test for new helper template

templates/layouts/partials/helpers/flags.jet.html

@@ -1,4 +1,5 @@
 {{ block flagList(languages=nil, selected="")}}
+{{ if isset(languages) }}
     {{ range _, language := languages }}
         <span class="input-group">
         <input type="checkbox" name="languages" id="lang-{{ language.Code }}" value="{{language.Code}}"{{if contains(selected, language.Code) }} checked{{end}}>
@@ -6,3 +7,4 @@
         </span>
     {{ end }}
 {{ end }}
+{{ end }}