Show better error message when access request denied

[melvin4u445]

Happens when access request is denied after the app is installed for the first time. We could show a better error message, something like "Please provide read and write access to use the app" or we could use all the white space to create a better error message screen explaining why we need access to their files

[melvin4u445]

Let's combine this with #234. Closing the ticket