rust-changelog: don't skip empty lines when iterating over changeset lines...
rust-changelog: don't skip empty lines when iterating over changeset lines
The first empty line in the changeset indicates the end of headers and
beginning of description. Callers can't know figure out where that
position is if empty lines are skipped.
Differential Revision:
https://phab.mercurial-scm.org/D12426
