Currently, we forcefully require that a default target be specified.
However, systemd does install a default target, but it's not
possible to just use that target.
Allow the user to blank-out the config setting to not override
whatever systemd installed and keep that.
Signed-off-by: Norbert Lange <nolange79@gmail.com>
[yann.morin.1998@free.fr:
- introduce the usual qstripped inter;ediate variable
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>