prevent the empty string as password
authorPhilipp Gesang <philipp.gesang@intra2net.com>
Fri, 31 Mar 2017 13:56:11 +0000 (15:56 +0200)
committerPhilipp Gesang <philipp.gesang@intra2net.com>
Tue, 25 Apr 2017 13:30:21 +0000 (15:30 +0200)
commit847988a99b4f528e3fa42f4cf8280dead42de22d
treecb64891ef18a279d68542e9322085b263406a5df
parenteab51cc10cb73d179645e2b6fb70b57813d87c75
prevent the empty string as password

backup.py would default to using the empty string as password
which would cause a crypto context to be created even without
encryption being required.

Use ``None`` instead to indicate absence of a user-supplied
password.
backup.py
deltatar/crypto.py