**Describe the bug** In any Catalogue/Subject page (eg: [https://papers.codechefvit.com/catalogue?subject=Data+Structures+And+Algorithms+%5BBCSE202L%5D](https://papers.codechefvit.com/catalogue?subject=Data+Structures+And+Algorithms+%5BBCSE202L%5D)), when no paper is selected, hitting "Download Selected" button downloads an empty "papers.zip" file of size 22 bytes. **To Reproduce** Steps to reproduce the behavior: 1. Go to any subject page 2. Click on "Download Selected" 3. A zip file with no contents and title "papers.zip" of size 22 bytes is downloaded. **Expected behavior** It should say a toast message like no paper is selected and should not download anything. **Screenshots** Not necessary, very simple to replicate. **Device Independent**