handle empty orders from queue

Trust/Market/OrdersRequest.swift

@@ -21,7 +21,7 @@ import BigInt
 public class OrdersRequest {
 
     public let baseURL = "https://482kdh4npg.execute-api.ap-southeast-1.amazonaws.com/dev/"
-    public let contractAddress = "0xacDe9017473D7dC82ACFd0da601E4de291a7d6b0"
+    public let contractAddress = "bC9a1026A4BC6F0BA8Bbe486d1D09dA5732B39e4".lowercased()
 
     public func getOrders(callback: @escaping (_ result : Any) -> Void) {
         Alamofire.request(baseURL + "contract/" + contractAddress, method: .get).responseJSON {
@@ -31,6 +31,11 @@ public class OrdersRequest {
                 let parsedJSON = try! JSON(data: response.data!)
                 for i in 0...parsedJSON.count - 1 {
                     let orderObj: JSON = parsedJSON["orders"][i]
+                    if(orderObj == nil)
+                    {
+                        callback("no orders")
+                        return
+                    }
                     orders.append(self.parseOrder(orderObj))
                 }
                 callback(orders)