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
29332	AdminReadonlyField  accepts the optional argument model_admin but treats it as non-optional	Josh	nobody	"Using a FieldSet without providing a `model_admin` results in an error since `AdminReadonlyField` calls: `model_admin.get_empty_value_display()`.

My expected behaviour is that it does not error, and sets the `empty_value_display` to the empty string.
Relevant file: https://github.com/django/django/blob/master/django/contrib/admin/helpers.py

Cheers."	Bug	closed	contrib.admin	1.11	Normal	duplicate			Unreviewed	0	0	0	0	1	0