fix: empty i18n options not loading vue-i18n config file

[BobbieGoede]

🔗 Linked issue

• chore(deps): update devdependency @nuxtjs/i18n to v8.5.2 nuxt/test-utils#930

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This regression was picked up in the @nuxt/test-utils examples, see nuxt/test-utils#930. Regression was introduced by #3054, hopefully this is not a common scenario (no options, but relying on i18n.config) and if it is I hope we caught it early 🙏

The edge case is pretty specific, if no options are passed to the module, whether inline or using the i18n key, the default i18n.config file was not loaded.

Will backport this to v8 after merging!

📝 Checklist

• I have linked an issue or discussion.
• I have added tests (if possible).
• I have updated the documentation accordingly.