[Android] Leaving Ring creation wizard should not be possible without creating an account
Issue generated from Tuleap's migration script. Originally submitted by: Alexandre Lision (alision)
The hardware back button and the arrow in the Action bar allow the user to exit the wizard and use the app without a valid Ring account.
It creates unwanted corner cases and issues, since the user can navigate in the app without any account.
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The back arrow should be removed if no other account exists (user may be creating a second account, in this case he is allowed to leave)
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The back button should exit the app, not depiling the Fragment.