fix: prevent undefined or empty currencies from being queried

[bergarces]

Explanation

CurrencyRateController was getting an unexpected error when the NetworkController.networkConfigurationsByChainId state included any configuration with nativeCurrency set as undefined.

The easiest way to prevent this error, as well as to avoid unnecessary results from the API that returns currency rates, is to filter out falsy values of nativeCurrency when updating currency rates.

References

• Fixes #12583

Changelog

@metamask/assets-controllers

• FIXED: Falsy values of nativeCurrency skipped when updating currency rates.

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've highlighted breaking changes using the "BREAKING" category above as appropriate
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes