create the directory as well

roles/mailman/tasks/main.yml

@@ -196,6 +196,12 @@
   notify:
     - restart mailman3
 
+- name: Create site/en dir
+  file: state=directory path=/var/lib/mailman3/templates/site/en
+  tags:
+  - config
+  - mailman
+
 - name: set default list footer
   copy: src=mailman-generic-list-footer
             dest=/var/lib/mailman3/templates/site/en/list:member:generic:footer
@@ -204,7 +210,6 @@
   - config
   - mailman
 
-
 #
 # Crontab
 #