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
13311	Template Tag modules that raise an ImportError are difficult to debug	amccurdy	nobody	"I have several template tag libraries that I register using the add_to_builtins function. While upgrading to Django 1.2, I found that one of these template tag libraries was raising an ImportError. The ImportError was hidden from me however, because django.template.import_library catches ImportError and simply returns None.  The None value still gets added to the django.template.builtins module-level variable, which eventually ends up making it's way to the Parser class's add_library function.  Parser.add_library references the .tags attribute without checking for None, raising an AttributeError. There's was no indication of which template tag library caused the error, making this a pain to track down.

I would suggest that django.template.import_library not mask the ImportError. If this breaks backwards compatibility, then at least raise the ImportError from django.template.add_to_builtins."		closed	Template system	1.2-beta		fixed	templatetag library		Accepted	0	0	0	0	0	0