* Early return if date range is empty * test: add tests for empty workingHours early return optimization Co-Authored-By: joe@cal.com <j.auyeung419@gmail.com> --------- Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com> Co-authored-by: Volnei Munhoz <volnei@cal.com>