Fail gracefully when remote icon is 404

app/services/app_catalog_manager/update_metadata.rb

@@ -45,8 +45,12 @@ module AppCatalogManager
       filename = "#{attachment_name}.png"
       key = "web_apps/#{@app.id}/icons/#{attachment_name}.png"
 
+      begin
         tempfile = Down.download(download_url)
         @app.send(attachment_name).attach(key: key, io: tempfile, filename: filename)
+      rescue Down::NotFound
+        Rails.logger.warn "Icon download failed: NotFound error for #{download_url}"
+      end
     end
   end
 end