fix test, indexedblockstore did not include genesis
fix test, indexedblockstore did not include genesis

you21979/NBitcoin,MetacoSA/NBitcoin,HermanSchoenfeld/NBitcoin,stratisproject/NStratis,dangershony/NStratis,thepunctuatedhorizon/BrickCoinAlpha.0.0.1,NicolasDorier/NBitcoin,lontivero/NBitcoin,bitcoinbrisbane/NBitcoin,MetacoSA/NBitcoin