catch NullReferenceException on missing RootProperty.dateTime in JsonDotNetSerializerExtensions
catch NullReferenceException on missing RootProperty.dateTime in JsonDotNetSerializerExtensions

WestDiscGolf/Fitbit.NET,aarondcoleman/Fitbit.NET,AlexGhiondea/Fitbit.NET,AlexGhiondea/Fitbit.NET,AlexGhiondea/Fitbit.NET,amammay/Fitbit.NET,WestDiscGolf/Fitbit.NET,amammay/Fitbit.NET,WestDiscGolf/Fitbit.NET,aarondcoleman/Fitbit.NET,amammay/Fitbit.NET,aarondcoleman/Fitbit.NET