[701] npm run generate and dynamic routes

Hi there,

I can't get dynamic routes to work with nuxt generate.. I must be missing something?

• create the starter project (vue init nuxt/starter <project-name>)
• add the folder/file "pages/posts/_id.vue"
• npm run generate

the docs tell me I should get an error (Could not generate the dynamic route /posts/:id, please add the mapping params in nuxt.config.js (generate.routeParams).)

But i don't get this error, its simply ignored and there is no file in the dist folder. Even if I do add the mapping params it is still ignored?

"npm run dev" works as expected

Thanks