chore(NPM Package Registry): fix info of non-exist pacakge (#9341)

Author: LitoMore

websites/N/NPM Package Registry/metadata.json

@@ -12,7 +12,7 @@
     "nl": "De Node Package Manager is een pakketbeheerder voor de JavaScript-runtime-omgeving node.js."
   },
   "url": "www.npmjs.com",
-  "version": "1.2.20",
+  "version": "1.2.21",
   "logo": "https://cdn.rcd.gg/PreMiD/websites/N/NPM%20Package%20Registry/assets/logo.png",
   "thumbnail": "https://cdn.rcd.gg/PreMiD/websites/N/NPM%20Package%20Registry/assets/thumbnail.png",
   "color": "#C12127",

websites/N/NPM Package Registry/presence.ts

@@ -15,6 +15,9 @@ presence.on('UpdateData', async () => {
   }
   else if (document.location.pathname.startsWith('/package/')) {
     presenceData.details = 'Viewing a package'
+    if (document.querySelector('img[alt*="Missing"]')) {
+      presenceData.details = 'Viewing a non-exist package'
+    }
     presenceData.state = 'Fetching...'
     if (document.location.pathname.split('/').length === 4) {
       presenceData.state = `${document.location.pathname.split('/')[2]}/${