hide the dir button when undecompressed

templates/repo/datasets/dataset_list.tmpl

@@ -18,7 +18,7 @@
         <span class="ui text center clipboard"  data-clipboard-text="{{.DownloadURL}}" data-tooltip='{{$.i18n.Tr "dataset.copy_url"}}' data-clipboard-action="copy">{{svg "octicon-file" 16}}</span>
       </div>
 
-      <div class="two wide column">
+      <div class="two wide column" style="{{if ne .DecompressState 1}}visibility: hidden{{end}}">
         <a class="ui button mini" href="datasets/dirs/{{.UUID}}" data-uuid={{.UUID}} data-dataset-dir data-dir-url="{{AppSubUrl}}/attachments/dir" data-csrf="{{$.CsrfToken}}">{{$.i18n.Tr "dataset.dir"}}</a>
       </div>