If the user has not unlocked any wallet yet and tries to create a new
wallet in the overview a dialog will prompt them to first unlock an
existing wallet in order to be able to create a new wallet.
This ensures they remember at least one password so they can complete
the wizard. The wizard will ask them for an existing password later and
it would be annoying for the user to go through all steps (writing down
the seed etc.) only to find out they need a password they don't
remember. This way they can reinstall the app right before going through
the wizard.
378a9e6112