293-Fix_null_pointer_exception_on_account_setup

Description

~Mail crashed on the login page. This MR fixes this issue.

Issue(s)

• https://gitlab.e.foundation/e/os/backlog/-/issues/293

Test environment

Download apk from https://gitlab.e.foundation/e/os/mail/-/jobs/299057/artifacts/file/app/k9mail/build/outputs/apk/debug/k9mail-debug.apk.

Test procedures

Open ~Mail (without any accounts setted-up in ~"Account Manager" ). Enter /e/ account credential in the login page. click next. App should proceed to login

Technical details

Screenshots

Check list

• Self review
• Test procedure explained
• Tested on fresh install
• Tested applied as an update
• License
• Internal documentation
• User documentation