When using a start date before the first commit to a repo, we should
include the repo's entire history (up to the end date) in our totals.
Instead, we were using a range like "..{upper_version}", which in Git
revision-range syntax means the start of the range is HEAD -- so the
range was empty.
Fix that by leaving out the ".." when we want no left endpoint.
Black 23 enforces some slightly more specific rules about empty line
counts and redundant parenthesis removal, but the result is still
compatible with Black 22.
(This does not actually upgrade our Python environment to Black 23
yet.)
Signed-off-by: Anders Kaseorg <anders@zulip.com>
This is still messy, in that it does the `chdir` using a different
library than the rest, but it's at least more consistent with the
codebase and it should be possible to bulk migrate the `ZULIP_PATH`
calculation, which we have in a dozen files, to pathlib later.
This will allow Zulip release announcements to credit contributions
made to Zulip projects beyond the server in our release announcements.
Fixes#19044.
