fix: DivisionByZero in intersection_over_self (#224)

Preventing intersection_over_self to trhow DivisionByZero when area of the element is zero

Signed-off-by: Maksym Lysak <[email protected]>
Co-authored-by: Maksym Lysak <[email protected]>

Author: maxmnemonic

docling_core/types/doc/base.py

@@ -182,7 +182,10 @@ def intersection_over_self(
     ) -> float:
         """intersection_over_self."""
         intersection_area = self.intersection_area_with(other=other)
-        return intersection_area / self.area()
+        if self.area() > 0:
+            return intersection_area / self.area()
+        else:
+            return 0.0
 
     def to_bottom_left_origin(self, page_height: float) -> "BoundingBox":
         """to_bottom_left_origin.