Only install ldap dependencies if needed

tasks/main.yml

@@ -5,12 +5,18 @@
       - mailman3-web
       - python3-mailman-hyperkitty
       - lynx # needed to convert html mail
+      - python3-mailmanclient
+
+- name: install mailman ldap dependencies
+  when: mailman.web.ldap|d(False)
+  package:
+    name:
       - python3-wheel
       - python3-pip
       - python3-django-auth-ldap
-      - python3-mailmanclient
 
-- name: install mailman addons via pip
+- name: install mailman ldap sync dependencies via pip
+  when: mailman.web.ldap.sync|d(False)
   notify: restart mailman
   loop:
     - git+https://git.cccv.de/uffd/postorius-ldap-membership-management.git
@@ -50,7 +56,6 @@
   meta: flush_handlers
 
 - name: "setup mailing list"
-  notify: restart mailman-web
   loop: "{{ mailman.lists|expand_dict_keys_with_defaults(mailman.list_defaults)|dict2items }}"
   loop_control:
     loop_var: current_list