If there are no projects to fetch, the progress meter would
have divided by zero during `repo sync`, and that throws a
ZeroDivisionError. Instead we report the progress with an
unknown amount remaining.
Signed-off-by: Shawn O. Pearce <sop@google.com>
This way users can see how much is left during fetch. Its
especially useful when most syncs are no-ops but there are
hundreds of repositories to poll.
Signed-off-by: Shawn O. Pearce <sop@google.com>
