validate-genesis not passing for exported genesis file

[kwunyeung]

Summary of Bug

gaiad validate-genesis not passing for an exported and migrated genesis file. Here is the output.

gaiad validate-genesis
validating genesis file at /Users/kwunyeung/.gaiad/config/genesis.json
ERROR: error validating genesis file /Users/kwunyeung/.gaiad/config/genesis.json: UnmarshalJSON cannot decode empty bytes

Version

gaiad v2.0.3 validating cosmoshub-3 genesis file

Steps to Reproduce

1. put the cosmoshub-3 genesis file in $HOME/.gaiad/config
2. run gaiad validate-genesis

The error is due to no genutil object in the cosmoshub-3 genesis file. It's better to report what is wrong in the genesis file instead of only reporting an error from an operation.

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned

[alexanderbez]

Thanks @kwunyeung! This is a duplicate of #5086 and resolved by #5499.

However, validating the hub-3 genesis file will still fail because app_state.gentxs is still null. So to make it pass validation, replace it with []. I don't think there is any other way to make it retroactively pass.