jinja2 default fiter set to None

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Hi,

is there any way how to set undefined variable to None /python/, null
/yaml/ value ?

The filter default sets it always to empty string ... Consider this in
defaults and emplate file ...

sshd_config_test_config: "{{ __sshd_config_test_config|default(None)}} "

{% macro print_scalar(item_name, item_value=None, ident=0,
comment=False) -%}
{% if item_value is not none %}
{{"\t" * ident}}{{ item_name }} {{ item_value }}
{%- elif comment %}
{{"\t" * ident}}# {{ item_name }}
{%- endif %}
{%- endmacro %}

{{ print_scalar('test_config', sshd_config_test_config, 0, True) }}

This will print config value with an empty string, the jinja2 template
does is when __sshd_config_test_config is not defined.

if __sshd_config_test_config is set to value or null, it works as
expected. This varialble is OS based and included in os-{{
ansible-os-family}}.yml.

I'm trying to avoid type all variables into all os specific files.

  thanks
    Peter