Missing option to delete a wiki page

PLEASE TEST THIS UNDER 21_STABLE 1. Log in as teacher/admin 2. Select a course and turn editing on 3. Add a Wiki activity to course 4. Select wiki and click on create page 5. Create 4 versions of the page (Repeat below steps 4 times) Click edit Modify text click Save 6. Add 1 pages Click edit Add [ [New page title] ]) in page text click save "New page title" link should be visible. Click on "New page title" 7. Create 4 versions of this page as well. (Same as step 5) 8. Go back to course and click on recently created wiki activity. 9. Click on Administration, and select "Delete page versions" 10. Select both radio buttons for version 3 and click "Delete page versions". (version 3 should no longer be visible) 11. Select version 2 and version 5 (or the last version which was created) and click "Delete page versions" (Only 1 version should be visible and no "delete page version should be visible") 12. Go back to course and click on recently created wiki activity. 13. Click on Administration 14. "New page title" page should be listed as "orphan page" 15. Click on Delete icon "x" and page should no longer be visible 16. Now click on "list all", it should list all pages in the wiki except "New page title" 13. Now delete all pages, by clicking on "x" (Similar to step 15) 14. when last page is deleted, it should show "edit page" with the option of creating page 15. Log in as student and you should not see Administration option and should not be able to delete any wiki by passing the delete link