avoid thread termination by catching exception thrown on failed times GET

src/BreCalClient/MainWindow.xaml.cs

@@ -472,6 +472,9 @@ namespace BreCalClient
                     }
                 }
 
+                try
+                {
+
                     if (shipcalls != null)
                     {
                         foreach (Shipcall shipcall in shipcalls)
@@ -511,6 +514,14 @@ namespace BreCalClient
                         this.FilterShipcalls();
                         await uiLock.WaitAsync();
                         this.UpdateUI();                        
+                    }
+                }
+                catch(Exception ex)
+                {
+                    _log.Error(ex);
+                }
+                finally
+                {
                     uiLock.Release();
                 }