add none check to matching_table_with_highest_intersection

docrecutils/utilities.py

@@ -33,7 +33,8 @@ def match_tables(tables_to_find_candidates: List[Table], matching_tables: List[T
                     highest_intersection = intersection.area
                     matching_table_with_highest_intersection = table_to_match
 
-        matching_tables.remove(matching_table_with_highest_intersection)
+        if matching_table_with_highest_intersection is not None:
+            matching_tables.remove(matching_table_with_highest_intersection)
         matched_tables[table] = matching_table_with_highest_intersection
 
     return matched_tables