fix issue

templates/repo/grampus/notebook/show.tmpl

@@ -372,8 +372,8 @@
                                                 <a href="{{.RepositoryLink}}" target="_blank">{{.DatasetName}}</a>
                                         {{end}}
                                         </td>
-                                        <td><div class="dataset_nowrap_two_line">{{.DatasetDownloadLink}}</div></td>
                                         {{if .DatasetDownloadLink}}
+                                        <td><div class="dataset_nowrap_two_line">{{.DatasetDownloadLink}}</div></td>
                                         <td class="center aligned"><a class="ui poping up clipboard" id="clipboard-btn-dataset" data-original="{{$.i18n.Tr "repo.copy_link"}}"  data-success="{{$.i18n.Tr "repo.copy_link_success"}}" data-error="{{$.i18n.Tr "repo.copy_link_error"}}"  data-content="{{$.i18n.Tr "repo.copy_link"}}" data-variation="inverted tiny" data-clipboard-text="{{.DatasetDownloadLink}}">{{$.i18n.Tr "dataset.download_copy"}}</a></td>
                                         {{end}}
                                     </tr>