Home » Documentation » Filters » randomize replace_args pprint match to_json filesizeformat if menu_trail reversed without_embedded_media show_media is_visible is_a replace random chunk twitter rand escape_ical force_escape utc is_undefined add_year add_month add_week sub_year sub_week sub_month sub_day add_day element in_past in_future truncate vsplit_in timesince yesno urlencode upper tail rjust nthtail member make_list lower ljust group_by linebreaksbr length_is length last join slugify stringify striptags split_in is_defined default_if_undefined default_if_none default format_price format_number format_integer escape unescape fix_ampersands first escapexml escapejs date date_range center capfirst ne_day eq_day insert append

default_if_none

Show the argument if the value is undefined.

Replaces undefined values with the argument.

For example:

{{ value|default_if_none:"that was undefined" }}

When the value is “” then the output is “”.  When the value is undefined then the output is “that was undefined”.

See also the filter default.