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 -*
REGION_CHOICES = (
('ABR', 'Abruzzo'),
('BAS', 'Basilicata'),
('CAL', 'Calabria'),
('CAM', 'Campania'),
('EMR', 'Emilia-Romagna'),
('FVG', 'Friuli-Venezia Giulia'),
('LAZ', 'Lazio'),
('LIG', 'Liguria'),
('LOM', 'Lombardia'),
('MAR', 'Marche'),
('MOL', 'Molise'),
('PMN', 'Piemonte'),
('PUG', 'Puglia'),
('SAR', 'Sardegna'),
('SIC', 'Sicilia'),
('TOS', 'Toscana'),
('TAA', 'Trentino-Alto Adige'),
('UMB', 'Umbria'),
('VAO', u'Valle d’Aosta'),
('VEN', 'Veneto'),
)