Handle unknown hashing systems more gracefully.
Handle unknown hashing systems more gracefully.

muchbeli/bitcoin-abe,gjhiggins/chaincoin-abe,ultracoindev/ultracoin-abe,BuckyGreen/latiumexplorer,Max-Coin/maxcoin-abe,cryptapus/bitcoin-abe,Cybnate/NuBits-Abe-explorer,CraigsCoin/abe-craigscoin,jeromewu/bitcoin-abe-opennet,Rimbit/RimbitExplorer,jonnynewbs/bitcoin-abe,machado-rev/HTMLCoinExplorer,muchbeli/bitcoin-abe,BuckyGreen/latiumexplorer,mmitech/bitcoin-abe,Cybnate/NuBits-Abe-explorer,Serya05/bitcoin-abe,gjhiggins/abe-bee2,machado-rev/HTMLCoinExplorer,ultracoindev/ultracoin-abe,jeromewu/bitcoin-abe-opennet,machado-rev/HTMLCoinExplorer,MatthewLM/PeercoinAbeExplorer,muchbeli/bitcoin-abe,machado-rev/HTMLCoinExplorer,n00bsys0p/altcoin-abe,leadcoin-reboot/leadcoin-abe,ultracoindev/ultracoin-abe,ultracoindev/ultracoin-abe,Max-Coin/maxcoin-abe,BuckyGreen/latiumexplorer,gjhiggins/abe-bee2,jeorgen/bitcoin-abe,Dilmacoin/dilmacoin-abe,gjhiggins/altcoin-abe,jonnynewbs/bitcoin-abe,Cybnate/NuBits-Abe-explorer,mmitech/bitcoin-abe,cryptapus/bitcoin-abe,MatthewLM/PeercoinAbeExplorer,leadcoin-reboot/leadcoin-abe,BuckyGreen/latiumexplorer,gjhiggins/chaincoin-abe,machinecoin-project/machinecoin-blockchainexplorer-abe,Rimbit/RimbitExplorer,Rimbit/RimbitExplorer,CraigsCoin/abe-craigscoin,UdjinM6/darkcoin-abe,Cybnate/NuBits-Abe-explorer,machinecoin-project/machinecoin-blockchainexplorer-abe,UdjinM6/darkcoin-abe,ultracoindev/ultracoin-abe,Rimbit/RimbitExplorer,Serya05/bitcoin-abe,MatthewLM/PeercoinAbeExplorer,muchbeli/bitcoin-abe,Cybnate/NuBits-Abe-explorer,Dilmacoin/dilmacoin-abe,MatthewLM/PeercoinAbeExplorer,jeorgen/bitcoin-abe,n00bsys0p/altcoin-abe,gjhiggins/abe-bee2,gjhiggins/altcoin-abe