ansible blank lines

apply-notification.conf.j2

// {{ ansible_managed }}

{% if icinga2_notification_apply.host_notification %}
apply Notification "slack-host-notification" to Host {

{%- for k, v in icinga2_notification_apply.host_notification.items() -%}

{% if k == 'import' %}
  {{ k }} = "{{ v }}"
{% elif k == 'assign_where' %}
  assign where {{ v }}
{% else %}
  {{ k }} = {{ v }}
{% endif %}
{%- endfor -%}

}
{% endif %}
// ---
{% if icinga2_notification_apply.service_notification %}
apply Notification "slack-service-notification" to Service {

{%- for k, v in icinga2_notification_apply.service_notification.items() -%}

{% if k == 'import' %}
  {{ k }} = "{{ v }}"
{% elif k == 'assign_where' %}
  assign where {{ v }}
{% else %}
  {{ k }} = {{ v }}
{% endif %}
{%- endfor -%}

}
{% endif %}

config

icinga2_notification_apply:
  host_notification:
    import: slack-host-notification
    interval: 2h
    assign_where: host.vars.notification.slack
  service_notification:
    import: slack-service-notification
    interval: 2h
    assign_where: host.vars.notification.slack

result

// Ansible managed: Do NOT edit this file manually!

apply Notification "slack-host-notification" to Host {  import = "slack-host-notification"
  interval = 2h
  assign where host.vars.notification.slack
}
// ---
apply Notification "slack-service-notification" to Service {  import = "slack-service-notification"
  interval = 2h
  assign where host.vars.notification.slack
}

try and error

this works:

// {{ ansible_managed }}

{% if icinga2_notification_apply.host_notification %}
apply Notification "slack-host-notification" to Host {
{% for k, v in icinga2_notification_apply.host_notification.items() %}
{% if k == 'import' %}
  {{ k }} = "{{ v }}"
{% elif k == 'assign_where' %}
  assign where {{ v }}
{% else %}
  {{ k }} = {{ v }}
{% endif %}
{%- endfor -%}

}
{% endif %}
// ---
{% if icinga2_notification_apply.service_notification %}
apply Notification "slack-service-notification" to Service {
{% for k, v in icinga2_notification_apply.service_notification.items() %}
{% if k == 'import' %}
  {{ k }} = "{{ v }}"
{% elif k == 'assign_where' %}
  assign where {{ v }}
{% else %}
  {{ k }} = {{ v }}
{% endif %}
{%- endfor -%}

}
{% endif %}