Introduce defaults to avoid failures

defaults/main.yml

@@ -10,6 +10,7 @@ proxy_maxconn: 100
 proxy_varnish_maxconn: 1000
 proxy_redirect_maps:
   domain: {}
+  domain-append-path: {}
   path: {}
 proxy_blacklist:
   ip:

templates/redirect.map.jinja2

-{% for key in proxy_redirect_maps[item] %}
+{% for key in proxy_redirect_maps[item]|default([]) %}
 {{ key }} {{ proxy_redirect_maps[item][key] }}
 {% endfor %}