Added error message to request acks.

Socket/Handlers/RequestHandler.cs

@@ -35,17 +35,18 @@ namespace HermesSocketServer.Socket.Handlers
                 _logger.Error(e, $"Failed to grant a request of type '{data.Type}'.");
             }
 
-            if (result == null || !result.Success)
+            if (result == null)
                 return;
 
             var ack = new RequestAckMessage()
             {
                 Request = data,
-                Data = result.Result,
-                Nounce = data.Nounce
+                Data = result.Success ? result.Result : null,
+                Nounce = data.Nounce,
+                Error = result.Success ? null : result.Result?.ToString()
             };
 
-            if (!result.NotifyClientsOnAccount)
+            if (!result.NotifyClientsOnAccount || !result.Success)
             {
                 await sender.Send(4, ack);
                 return;