* 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>
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Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Volnei Munhoz <volnei@cal.com>