[FIX] handle no str or unicode values (lp:c2c-addons/6.1  rev 50)
[FIX] handle no str or unicode values
(lp:c2c-addons/6.1  rev 50)

OCA/carrier-delivery,Antiun/carrier-delivery,factorlibre/carrier-delivery,Endika/carrier-delivery,akretion/delivery-carrier