Fix for empty messages

DeukBot4/MessageHandlers/CommandHandler/CommandHandler.cs

@@ -38,6 +38,9 @@ namespace DeukBot4.MessageHandlers.CommandHandler
 
         public static async Task HandleMessage(SocketMessage message)
         {
+            if (string.IsNullOrWhiteSpace(message.Content))
+                return;
+
             if (message.Content[0] != CommandTrigger) return;
             var req = await CommandRequest.Create(message);
             var resultCode = req.Item2;