I stumbled upon this error message after porting a project to
magic-removal. In the admin, if I try to get the list view for
something like:

class SomeModel(models.Model):
     title = models.CharField(maxlength=200)
     date_due = models.DateField(blank= True, null=True)

    class Admin:
                date_hierarchy ='date_due'

I get this confusing error:
"Exception Value:       global name 'date_query' is not defined
Exception Location:     magic-removal/django/db/models/query.py in
iterator, line 479"

it took me sometime to realize that you can't have 'date_hierarchy' on
a datefield that can be blank.
anyways, I though I'd post it here in case someone struggles over this
too. 

ps: on trunk I get no error.


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