EmailField: unable to make it mandatory?

Hello all and happy new year,

with Django 1.7, i have this model:
class Subscription(models.Model):
email = models.EmailField(max_length=75)
created_by = models.ForeignKey(User)

sub = Subscription.objects.create(created_by=self.user)
this does not product an error due to email missing.

I also tried:
email = models.EmailField(max_length=75, null=False, blank=False)
without success

The database is postgresql, the command "manage.py sql" shows:
CREATE TABLE "eventsmgmt_subscription" (
"email" varchar(75) NOT NULL,

in fact, the email is filled with a null string ''.

How can i deal with this?


Thanks in advance for help,

--
Gérard Henry

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