Odd formatting on comments near ends of blocks

[liampwll]

Given the following input:

   --  aaa
   if X then
      --  bbb
      Y;
      --  ccc
   end if;

GNATformat produces the following output (including the extra line break):

   --  aaa
   if X then
      --  bbb
      Y;
   --  ccc

   end if;

It seems like it would be more sensible to leave this as it is in the input.