fix(nuxt): handle pages with no content and log warning (#20373)

packages/nuxt/src/pages/page-meta.ts

@@ -109,7 +109,14 @@ export const PageMetaPlugin = createUnplugin((options: PageMetaPluginOptions) =>
       }
 
       if (!hasMacro && !code.includes('export { default }') && !code.includes('__nuxt_page_meta')) {
+        if (!code) {
+          s.append(CODE_EMPTY + (options.dev ? CODE_HMR : ''))
+          const { pathname } = parseURL(decodeURIComponent(pathToFileURL(id).href))
+          console.error(`The file \`${pathname}\` is not a valid page as it has no content.`)
+        } else {
           s.overwrite(0, code.length, CODE_EMPTY + (options.dev ? CODE_HMR : ''))
+        }
+
         return result()
       }