T2725: Fix config parse for users without passwords
T2725: Fix config parse for users without passwords

Fix for https://phabricator.vyos.net/T2725

T2492 / a07e22377ab83104ac925e13d1824f241f0f8d4a
introduced a change which broke the initialization of
the user dict. In case the config contained an user
without an encrypted-password set, the property would
be missing and the commit would crash with
`KeyError: 'password_encrypted'`

vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x