Comment 2 for bug 1594776

With this patch the desired behavior is restored:
"""
$ fakeroot ./add-apt-repository ppa:juju/next
Cannot add PPA: 'ppa:~juju/ubuntu/next'.
The team named '~juju' has no PPA named 'ubuntu/next'
Please choose from the following available PPAs:
 * '1.22': 1.22 Updates
 * '1.22-proposed': 1.22 Proposed
 * '1.23': 1.23 Updates
 * 'daily': Juju Daily
 * 'devel': juju devel packages
 * 'enablement': Juju Enablement
 * 'experimental': juju experimental packages
 * 'golang': juju-golang
 * 'proposed': juju proposed packages
 * 'stable': juju stable packages
"""