Issue #208: fixed issue with calling CheckOrders after starting TradeMonitor event MtApi has disconnected state

Author: vdemydiuk

MtApi/Monitors/TradeMonitor.cs

@@ -40,7 +40,13 @@ protected override void OnStart()
                 InitialCheck();
             base.OnStart();
         }
-        protected override void OnTriggerRaised() => Check();
+
+        protected override void OnTriggerRaised()
+        {
+            if (IsMtConnected)
+                Check();
+        }
+        
         private void Check()
         {
             try