Have return no rules when no slugs

src/app/robots.ts

@@ -1,6 +1,8 @@
 import { getAllUrls } from "@/lib/db/urls"
 import type { MetadataRoute } from "next"
 
+export const dynamic = "force-dynamic"
+
 export default async function robots(): Promise<MetadataRoute.Robots> {
     const slugs = (await getAllUrls()).map(s => `/r/${s.slug}`)
 
@@ -13,11 +15,15 @@ export default async function robots(): Promise<MetadataRoute.Robots> {
         crawlDelay: 60
     }]
 
-    const dynamicRules: MetadataRoute.Robots["rules"] = [{
-        userAgent: allowedBots,
-        allow: slugs,
-        crawlDelay: 1
-    }]
+    console.log(slugs.length)
+
+    const dynamicRules: MetadataRoute.Robots["rules"] = slugs.length > 0 ?
+        [{
+            userAgent: allowedBots,
+            allow: slugs,
+            crawlDelay: 1
+        }] :
+        []
 
     return {
         rules: [...mainRules, ...dynamicRules, {