Janrhijn fix nullable properties not read #139

Job	Run time
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/FormModels)	1m 55s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/AllOf)	1m 55s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/AnyOfNoCompare)	3m 17s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/AllOf)	1m 4s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/UseDateTimeForDate)	2m 5s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/OneOf)	2m 15s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/Petstore)	1m 37s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/AnyOfNoCompare)	1m 31s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/FormModels)	1m 55s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/AnyOf)	1m 37s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/AnyOf)	2m 3s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/UseDateTimeForDate)	1m 1s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/OneOf)	1m 55s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/Petstore)	2m 3s
	26m 13s

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