unstructured

e35306cf - fix: table evaluation metrics fix calculations when no tables found in predictions (#2619)

fix: table evaluation metrics fix calculations when no tables found in predictions (#2619) The current way table structure metrics are computed does not cover cases when none table is found and all stats are empty. This PR fixes this + adds some hardenning tests for table eval processor. --------- Co-authored-by: Yao You <theyaoyou@gmail.com>