No need to check on render anymore

lib/render.js

@@ -14,11 +14,6 @@ setAnsiColors(ansiHTML)
 export async function render (req, res) {
   // Wait for nuxt.js to be ready
   await this.ready()
-  // Check if project is built for production
-  if (!this.renderer && !this.dev) {
-    console.error('> No build files found, please run `nuxt build` before launching `nuxt start`') // eslint-disable-line no-console
-    process.exit(1)
-  }
   /* istanbul ignore if */
   if (!this.renderer || !this.appTemplate) {
     return new Promise((resolve) => {