Fix a possible exception when a "choice" key wasn't found in the toast arguments.

Author: hmz777

NetStalker/NetStalker/ToastNotifications/NotificationChoice.cs

@@ -13,5 +13,6 @@ public enum NotificationChoice
         Show,
         Block,
         Suppress,
+        None
     }
 }

NetStalker/NetStalker/ToastNotifications/ToastAPI.cs

@@ -86,11 +86,18 @@ private async static void Notifications_OnActivated(ToastNotificationActivatedEv
                 return;
             }
 
-            if (!Enum.TryParse<NotificationChoice>(args["Choice"], out NotificationChoice NotificationChoice))
+            if (!args.Contains("Choice"))
             {
                 return; //No choice to select then no action required e.g. body tapped
             }
 
+            NotificationChoice NotificationChoice = NotificationChoice.None;
+
+            if (!Enum.TryParse<NotificationChoice>(args["Choice"], out NotificationChoice))
+            {
+                return; //No valid choice, we return
+            }
+
             switch (Enum.Parse(typeof(NotificationPurpose), args["Action"]))
             {
                 case NotificationPurpose.NotificationsSuppression: