Removed ``blank=True`` from the ``last_check`` field of the Domain model.
Removed ``blank=True`` from the ``last_check`` field of the Domain model.

d9pouces/django-powerdns-manager,kumina/django-powerdns-manager,gnotaras/django-powerdns-manager,kumina/django-powerdns-manager,d9pouces/django-powerdns-manager,gnotaras/django-powerdns-manager