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b88af5d65e
Seven year ago rails `session.keys` could be empty if the session was
not loaded yet.
To prevent an error the removed code was introduced
https://github.com/heartcombo/devise/issues/2660
Since then rails changed the behaviour and makes sure that the session
is loaded before someone wants to access any session keys
3498aacbbe
Which means the `session.empty?` is not needed anymore once Rails 5.2+
and upwards only supported.