Fix 500 when saving /site/edit without email
When saving /site/edit with no no_reply_email set, a 500 error page
would be returned due to an empty value being passed as value to
the datastore (which is not allowed for email fields).
# -*- coding: utf-8 -*
from django.utils.translation import ugettext_lazy as _
STATE_CHOICES = (
('AG', _('Aargau')),
('AI', _('Appenzell Innerrhoden')),
('AR', _('Appenzell Ausserrhoden')),
('BS', _('Basel-Stadt')),
('BL', _('Basel-Land')),
('BE', _('Berne')),
('FR', _('Fribourg')),
('GE', _('Geneva')),
('GL', _('Glarus')),
('GR', _('Graubuenden')),
('JU', _('Jura')),
('LU', _('Lucerne')),
('NE', _('Neuchatel')),
('NW', _('Nidwalden')),
('OW', _('Obwalden')),
('SH', _('Schaffhausen')),
('SZ', _('Schwyz')),
('SO', _('Solothurn')),
('SG', _('St. Gallen')),
('TG', _('Thurgau')),
('TI', _('Ticino')),
('UR', _('Uri')),
('VS', _('Valais')),
('VD', _('Vaud')),
('ZG', _('Zug')),
('ZH', _('Zurich'))
)