We're not seeing *exactly* #1314991 any more, but we're seeing
something that looks quite similar: the first attempt to find
updates just doesn't find any. No error message, no updates. I
have reported a bug for this and am investigating it, in the
meantime, let's restore the workaround, elaborated a bit, and
looking for the 'Software is up to date' screen instead of the
error message.
Signed-off-by: Adam Williamson <awilliam@redhat.com>