Rails - Sep 2005 - cache and HTTP_HOST

When there is no HTTP_HOST variable, code like

<b>Hello <%= @name %></b>
   <% cache do %>
     All the topics in the system:
     <%= render_collection_of_partials "topic", Topic.find_all
%>
   <% end %>

returns a "undefined method "+" for nil:NilClass" exception.

I''d hate to write code like:

<% foo=capture do %>
     All the topics in the system:
     <%= render_collection_of_partials "topic", Topic.find_all
%>
<% end %>

<b>Hello <%= @name %></b>
<% if @request.env[''HTTP_HOST''] %>
   <% cache do %>
     <%= foo %>
   <% end %>
<% else %>
   <%= foo %>
<% end %>

How do the others here handle this?

-- 
Justin Dossey