Handle the case of none existing enumerations using no-data blocks (#24776).

Patch by Mischa The Evil.

git-svn-id: https://svn.redmine.org/redmine/trunk@16188 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/enumerations/index.html.erb

@@ -28,6 +28,8 @@
 <% end %>
 </table>
 <% reset_cycle %>
+<% else %>
+<p class="nodata"><%= l(:label_no_data) %></p>
 <% end %>
 <% end %>