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
28719	Add a helpful exception message when ListView.get_queryset() returns None	Bjorn Kristinsson	Tim Graham <timograham@…>	"One of my `ListViews` suddenly started raising `TemplateDoesNotExist` with a rather cryptic (to me) message:

{{{
Template-loader postmortem
 
Django tried loading these templates, in this order:
 
Using engine :
This engine did not provide a list of tried templates.
}}}

It took me a while to realise this was because my get_queryset wasn't returning anything. It did some filtering based on user settings, and I didn't have a fallback for when none of the filtering steps applied.

Thought it might be helpful to have a better message is no template names are found and `object_list` is `None`. Suggesting: ""Expected a queryset, but found None. Please check that <cls>.get_queryset() returns a queryset."" Pull request coming up."	Cleanup/optimization	closed	Generic views	dev	Normal	fixed		Bjorn Kristinsson Herbert Fortes	Ready for checkin	1	0	0	0	1	0