Reractored functions GetOrder and GetOrders in MQL part.

TestClients/TestApiClientUI/Form1.cs

@@ -4,7 +4,7 @@ using System.Drawing;
 using System.Windows.Forms;
 using MtApi;
 using System.Threading.Tasks;
-using System.Collections;
+using System.Linq;
 
 namespace TestApiClientUI
 {
@@ -885,7 +885,7 @@ namespace TestApiClientUI
 
             var orders = await Execute(() => _apiClient.GetOrders(selectSource)); ;
 
-            if (orders != null)
+            if (orders != null && orders.Count() > 0)
             {
                 foreach (var order in orders)
                 {
@@ -896,6 +896,10 @@ namespace TestApiClientUI
                     AddToLog(result);
                 }
             }
+            else
+            {
+                AddToLog("GetOrders: 0 orders");
+            }
         }
 
         //OrderSendBuy