table: block_test: better error reporting
table: block_test: better error reporting

btcsuite/goleveldb,zzl0/goleveldb,rentongzhang/goleveldb,syndtr/goleveldb,ngaut/goleveldb,conseweb/goleveldb,trigrass2/goleveldb,FactomProject/goleveldb,hustbill/goleveldb,chai2010/goleveldb,no2key/goleveldb