address issue (TryDequeue return True but get null result)
address issue (TryDequeue return True but get null result)

https://github.com/alexandrnikitin/MPMCQueue.NET/issues/2

masteryee/protoactor-dotnet,AsynkronIT/protoactor-dotnet,tomliversidge/protoactor-dotnet,masteryee/protoactor-dotnet,tomliversidge/protoactor-dotnet