rawtx: Avoid crash on coinbase transactions.
rawtx: Avoid crash on coinbase transactions.

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