Respond to getblockchaininfo with genesis block when empty state

[elijahhampton]

Motivation

A lightwalletd test fails for getblockchaininfo when the state is empty. This PR refactors the rpc request to return the genesis block.

Specifications & References

Solution

Adds a test for returning the genesis state in prop.rs. Refactors getblockchaininfo rpc to return the genesis block if TipPoolValues request fails.

Tests

Follow-up Work

PR Author's Checklist

• The PR name will make sense to users.
• The PR provides a CHANGELOG summary.
• The solution is tested.
• The documentation is up to date.
• The PR has a priority label.

PR Reviewer's Checklist

• The PR Author's checklist is complete.
• The PR resolves the issue.

[oxarbitrage]

This looks really good, thank you for making it. There are a few non used imports that need to be fixed. I also left some small optional suggestions in the test code.

[mergify]

This pull request has been removed from the queue for the following reason: checks failed.

The merge conditions cannot be satisfied due to failing checks:

• ❌ Unit tests / Test integration with lightwalletd
• ☑️ Build CD Docker / Build images
• ☑️ Get disk name / Get Mainnet cached disk
• ☑️ Test CD custom Docker config file / Test custom-conf in Docker
• ☑️ Test CD default Docker config file / Test default-conf in Docker
• ☑️ Test CD testnet Docker config file / Test testnet-conf in Docker

You should look at the reason for the failure and decide if the pull request needs to be fixed or if you want to requeue it.

If you want to requeue this pull request, you need to post a comment with the text: @mergifyio requeue

[mpguerra]

@mergify requeue

[mergify]

requeue

✅ The queue state of this pull request has been cleaned. It can be re-embarked automatically