Improved Peppol documents

Fixed error when trying to send through Peppol but the receiver is not able to receive the document on its access point. The errors reported so far were: “Document format cannot be blank” and “Endpoint ID not registered on the Peppol network to receive invoices. Contact your customer to inform them of this problem”. From now on, if this error occurs and the receiver is able to receive another type of document that B2Brouter can generate, you only need to modify and save the contact data for the error to disappear.