Fix undefined other in chargeCustomer

Author: Amine Mouafik

lib/AuthorizeNetGateway.js

@@ -486,7 +486,7 @@ AuthorizeNetGateway.prototype.createCustomerProfile = function (payment, billing
  * IMPORTANT TO NOTE,at the moment if the customer has several payment profiles the payment profile used will always be the first one
  */
 AuthorizeNetGateway.prototype.chargeCustomer = function (order, prospect, other) {
-
+  other = other || {}
   return this.getCustomerProfile(prospect.profileId)
     .then(function (res) {