Fix: Return empty command instead of panic for empty ibc timeout_packet

[vincentysc]

Issue:

panic: panic when parsing block at height 13123448: missing timeout_packet event in TxsResult log

Got empty timeout_packet in msg_index=1 log
https://rest.mainnet.crypto.org/cosmos/tx/v1beta1/txs/1865B4678750DD77E1834BA78A5FCAE4D827B91DA101C4BBB6492793038D4CA7

IBC transfer refunded in DD7E643082DC29337CFC09D033A509D1EF4D0693DFD0C483CE4D1C0147B00A60

but show in 1865B4678750DD77E1834BA78A5FCAE4D827B91DA101C4BBB6492793038D4CA7 too with empty timeout_packet

The refund data

{
  "amount": "300000000",
  "denom": "basecro",
  "receiver": "umee163ndtplrrpkh2faf2c0y6t9v86llx86qqa0dul",
  "sender": "cro163ndtplrrpkh2faf2c0y6t9v86llx86q2s6tyu"
}

Solution:

Skip the extra IBC timeout message