--- FAIL: TestKeys (0.14s)
panic: validator set initialization slice cannot be an empty slice (but it can be nil) [recovered]
    panic: validator set initialization slice cannot be an empty slice (but it can be nil)

goroutine 56 [running]:
testing.tRunner.func1(0xc000190e00)
    /usr/local/go/src/testing/testing.go:792 +0x387
panic(0xe74c40, 0x14b6880)
    /usr/local/go/src/runtime/panic.go:513 +0x1b9
github.com/cosmos/cosmos-sdk/vendor/github.com/tendermint/tendermint/types.NewValidatorSet(0x1d1a448, 0x0, 0x0, 0x1d1a448)
    /home/alessio/work/tendermint/src/github.com/cosmos/cosmos-sdk/vendor/github.com/tendermint/tendermint/types/validator_set.go:35 +0x282
github.com/cosmos/cosmos-sdk/vendor/github.com/tendermint/tendermint/consensus.(*Handshaker).ReplayBlocks(0xc000b59080, 0x7, 0x0, 0x1005f91, 0x6, 0xc00003a2c0, 0xf, 0x0, 0x0, 0x0, ...)
    /home/alessio/work/tendermint/src/github.com/cosmos/cosmos-sdk/vendor/github.com/tendermint/tendermint/consensus/replay.go:283 +0x3c2
github.com/cosmos/cosmos-sdk/vendor/github.com/tendermint/tendermint/consensus.(*Handshaker).Handshake(0xc000b59080, 0x14d15c0, 0xc000245880, 0x2, 0x14c7080)
    /home/alessio/work/tendermint/src/github.com/cosmos/cosmos-sdk/vendor/github.com/tendermint/tendermint/consensus/replay.go:252 +0x4c8
github.com/cosmos/cosmos-sdk/vendor/github.com/tendermint/tendermint/node.NewNode(0xc0008a05a0, 0x14c83c0, 0xc0000d6140, 0xc0001ac3b0, 0x14bacc0, 0xc000b5b080, 0xc0001ac3a0, 0x13c7db8, 0xc0001ac470, 0x14c7080, ...)
    /home/alessio/work/tendermint/src/github.com/cosmos/cosmos-sdk/vendor/github.com/tendermint/tendermint/node/node.go:204 +0x6cf
github.com/cosmos/cosmos-sdk/client/lcd.startTM(0xc0008a05a0, 0x14c7080, 0xc0004ba980, 0xc0004a0a00, 0x14c83c0, 0xc0000d6140, 0x14cdc20, 0xc000919c00, 0x0, 0x0, ...)
    /home/alessio/work/tendermint/src/github.com/cosmos/cosmos-sdk/client/lcd/test_helpers.go:340 +0x27e
github.com/cosmos/cosmos-sdk/client/lcd.InitializeTestLCD(0xc000190e00, 0x1, 0xc000b77f30, 0x1, 0x1, 0x14d3b80, 0xc00007fb30, 0xc000210460, 0x14, 0x20, ...)
    /home/alessio/work/tendermint/src/github.com/cosmos/cosmos-sdk/client/lcd/test_helpers.go:302 +0x2015
github.com/cosmos/cosmos-sdk/client/lcd.TestKeys(0xc000190e00)
    /home/alessio/work/tendermint/src/github.com/cosmos/cosmos-sdk/client/lcd/lcd_test.go:45 +0x138
testing.tRunner(0xc000190e00, 0x13c7d50)
    /usr/local/go/src/testing/testing.go:827 +0xbf
created by testing.(*T).Run
    /usr/local/go/src/testing/testing.go:878 +0x353
FAIL    github.com/cosmos/cosmos-sdk/client/lcd    0.165s

-               nextVals := types.TM2PB.ValidatorUpdates(state.NextValidators) // state.Validators would work too.
+               validators := make([]*types.Validator, len(h.genDoc.Validators))
+               for i, val := range h.genDoc.Validators {
+                       validators[i] = types.NewValidator(val.PubKey, val.Power)
+               }
+               validatorSet := types.NewValidatorSet(validators)
+               nextVals := types.TM2PB.ValidatorUpdates(validatorSet)
                csParams := types.TM2PB.ConsensusParams(h.genDoc.ConsensusParams)