XXX software/rapid-cdn: Fix inconsistency

Empty path shall result with /, not with an empty string. Even if it is
handled by some backends, it's a kind of a lie, especially, when additional
path from the request come in.

XXX - is that really the place to fix it?

software/rapid-cdn/buildout.hash.cfg

@@ -50,7 +50,7 @@ md5sum = d56e2cfab274cbbbe5b387f2f6e417df
 
 [template-backend-haproxy-configuration]
 _update_hash_filename_ = templates/backend-haproxy.cfg.in
-md5sum = 13942d8f5525b748cf3cfc2665a87f63
+md5sum = f8acde3585580b82d20e341ffae7e517
 
 [template-empty]
 _update_hash_filename_ = templates/empty.in

software/rapid-cdn/templates/backend-haproxy.cfg.in

@@ -94,7 +94,7 @@ frontend https-backend
 backend {{ slave_instance['slave_reference'] }}-{{ scheme }}
 {%-       set hostname = info_dict['hostname'] %}
 {%-       set port = info_dict['port'] %}
-{%-       set path_list = [info_dict['path'].rstrip('/')] %}
+{%-       set path_list = [info_dict['path'].rstrip('/') or '/'] %}
 {%-       set query = info_dict['query'] %}
 {%-       if query %}
 {%-         do path_list.append(query) %}