Fix last value updating for RSI indicator

[bartlaw]

Pull Request

It fixes this issue: https://github.com/nautechsystems/nautilus_trader/issues/2673

Summary

It sets the previous indicator value for next iteration in case of division by 0

Related Issues/PRs

https://github.com/nautechsystems/nautilus_trader/issues/2673

Type of change

• [x] Bug fix (non-breaking)
• [ ] New feature (non-breaking)
• [ ] Breaking change (impacts existing behavior)
• [ ] Documentation update
• [ ] Maintenance / chore

Breaking change details (if applicable)

Release notes

• [x] I added a concise entry to RELEASES.md that follows the existing conventions (when applicable)

Testing

Ensure new or changed logic is covered by tests.

• [ ] Affected code paths are already covered by the test suite
• [ ] I added/updated tests to cover new or changed logic

I've tested code by running extensive backtest and comparing results.

[CLAassistant]

All committers have signed the CLA.

[cjdsellers]

Hi @bartlaw

Many thanks for the fix.

Is it possible to add one test which triggers the condition? :pray:

[bartlaw]

Hi @cjdsellers Thanks for pointing this out. I've added a test that passes only after this bug fix. Let me know if I should do anything else. I am new to open source dev.

[cjdsellers]

Thanks for adding the test, much appreciated!