id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
21694	Default filter cannot be used with undefined variables	Mitar	nobody	"I wanted to assign a default value from a variable:

{{{
{% with heading=heading|default:title|default:""unknown"" %}

{% endwith %}
}}}

But if variable `title` is missing, rendering simply fails, without any exception (even in debug mode) but also without setting `heading` to `""unknown""`. From looking at the source code I understand that this happens because `default` filter is implemented using simple tags which expect that all filter arguments are defined, but it is unexpected behavior in this particular case."	Bug	closed	Template system	1.4	Normal	wontfix		mmitar@…	Unreviewed	0	0	0	0	0	0