fix: try to create django users for IDAs only when service name is sp…

…ecified

When creating a django user for edxapp and not for IDA (i.e. when
service name is not specified), we don't want the tasks that create
django users in IDAs to be executed, because they don't pass `lms`
and/or `cms` to `manage.py`, so these tasks fail for edxapp. To fix that
we add a predicate that checks that service name has been specified to
these tasks, so they only run when creating a django user for an IDA.

playbooks/manage_edxapp_users_and_groups.yml

@@ -197,7 +197,7 @@
         {% if item.get('permissions', []) | length %}--permissions {{ item.permissions | default([]) | map('quote') | join(' ') }}{% endif %}
         {% if item.get('remove') %}--remove{% endif %}
       with_items: "{{ django_groups }}"
-      when: (not group_environment) or group_environment in item.environments
+      when: (service | length > 0) and (not group_environment) or group_environment in item.environments
       become: true
       become_user: "{{ common_web_user }}"
 
@@ -214,7 +214,7 @@
         {% if item.get('unusable_password') %}--unusable-password{% endif %}
         {% if item.get('initial_password_hash') %}--initial-password-hash {{ item.initial_password_hash | quote }}{% endif %}
       with_items: "{{ django_users }}"
-      when: not item.get('unusable_password')
+      when: (service | length > 0) and not item.get('unusable_password')
       register: manage_users_result
       failed_when: (manage_users_result is failed) and not (ignore_user_creation_errors | bool)
       retries: 3
@@ -235,7 +235,7 @@
         {% if item.get('unusable_password') %}--unusable-password{% endif %}
         {% if item.get('initial_password_hash') %}--initial-password-hash {{ item.initial_password_hash | quote }}{% endif %}
       with_items: "{{ django_users }}"
-      when: item.get('unusable_password')
+      when: (service | length > 0) and item.get('unusable_password')
       register: manage_users_result
       failed_when: (manage_users_result is failed) and not (ignore_user_creation_errors | bool)
       retries: 3