access_token is not set if it passed as null in parameter (#165)
access_token is not set if it passed as null in parameter (#165)

facebook-csharp-sdk/facebook-csharp-sdk,simpleverso/facebook-csharp-sdk,ladyquartermaine/facebook-csharp-sdk,ladyquartermaine/facebook-csharp-sdk,Ali-Shaltout/facebook-csharp-sdk,facebook-csharp-sdk/facebook-csharp-sdk,swiese/facebook-csharp-sdk,simpleverso/facebook-csharp-sdk,Ali-Shaltout/facebook-csharp-sdk,swiese/facebook-csharp-sdk