fix(nuxt): don't force prerender / if user doesn't have that route

[danielroe]

🔗 Linked issue

nuxt/nuxt#14168

❓ 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

With pages module, we add routes to the default routes values. But if the user doesn't have a ~/pages/index.vue file we can safely skip processing the default / route for prerender.routes.

📝 Checklist

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

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[Atinux]

What about if the user has an app.vue but no pages? I think we should keep rendering the home page in that case

[danielroe]

Yes, agreed. This change only affects the pages ad-hoc module. (So it only prevents force-rendering a 404.)

[pi0]

Would it still generate index.html for spa mode? (it is main fallback file) (checked, it does with /index.html route)