Both yes and no. About:blank web pages are not dangerous to your computer or device by definition. They're part of the system, so seeing the page every now and again isn't a huge deal. However, if you're seeing a lot of blank pages, there's probably something wrong.
This page may appear instead of your home page if your internet browser has been corrupted. It's a good idea to do a security scan if it's something you observe frequently without user provocation.