We have two representations of sections without a name: the main
section uses name=None, the others name=''.  Standardize on name=None.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Message-Id: <20171002141341.24616-8-armbru@redhat.com>
Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com>