Made TradeOwner nullable bool
Made TradeOwner nullable bool

According to issue #128 we may get null.

trydis/FIFA-Ultimate-Team-Toolkit,lorenzh/FIFA-Ultimate-Team-Toolkit,trydis/FIFA-Ultimate-Team-2015-Toolkit,tringler/FIFA-Ultimate-Team-Toolkit,CoverJ/FIFA-Ultimate-Team-Toolkit,kauefelipe/FIFA-Ultimate-Team-Toolkit