JSON response returns code but no error message on return=sync

[fedekunze]

Summary of Bug

Broadcast POST /txs with return=sync returns error code without any message:

{
  "height": "0", // fixed according to Fabo on the next SDK release
  "txhash": "9820BFF17B54F8AD24E88902B6785A089C80AAA022371699FA1C732924129368",
  "code": 4 // unauthorized, no error_message
}

Probably it's the base error code's messages which are not returned?

https://github.com/cosmos/cosmos-sdk/blob/develop/types/errors.go

Steps to Reproduce

Couldn't reproduce anymore after I restarted the local-testnet, but probably was because of signature verification error.

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For Admin Use

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[alexanderbez]

Can you test with the latest develop @fedekunze? This logic was recently changed.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[tac0turtle]

This flow has changed with stargate. Please try reproducing the issue.