Added small fix for retrieval of non-Exchange deleted tasks

Outlook2013TodoAddIn/AppointmentsControl.cs

@@ -240,9 +240,16 @@ namespace Outlook2013TodoAddIn
         {
             List<OLTaskItem> tasks = new List<OLTaskItem>();
             foreach (object item in todoFolder.Items)
+            {
+                try
                 {
                     tasks.Add(new OLTaskItem(item));
                 }
+                catch
+                {
+                    // Do nothing, probably the task had already been deleted
+                }
+            }
             return tasks.Where(t => t.ValidTaskItem).ToList(); // Filter out invalid ones
         }