Reproduce the issue:
- You have Blank Component assigned to the home page of your Joomla! site.
- When you manually enter a wrong url you don't get any 404 error. Your site redirects all the non-existing urls to the home page.
Joomla redirects all the non-existing urls to the router of the component assigned as home page. Blank component does not have a router so you just get redirected to the home page.
This is a dummy empty router that will force an empty
option be set if the component router is called to parse any url. This should not break anything because Blank Component cannot work without a menu item assigned to it. It only ensures that the router does not parse any url.