fix(nuxt) : add default value for nitro.rollupConfig.plugins

[huang-julien]

🔗 Linked issue

resolve nuxt/nuxt#13927

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 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)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

rollup config is undefined and the import plugin registration is trying to push the plugin into an empty array here.
fixed by setting

    rollupConfig: {
      plugins: []
    }

into nitroConfig at package/nuxt/core/nitro.ts

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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[pi0]

LGTM Thanks!