handle edge case where a shipment has no shipping_method
handle edge case where a shipment has no shipping_method

surfdome/spree_wombat,CasperSleep/spree_wombat,3drobotics/spree_wombat,ledbury/spree_wombat,spartansystems/spree_wombat,Pixelbash/spree_zapier,spree/spree_wombat,petlove/spree_wombat,DynamoMTL/spree_wombat