Odd coding IF block style in PL / SQL

Question

Where I work, I see a lot of the following type of code written in PL / SQL,

IF a>b THEN
  NULL;
ELSE
  c:=a*b;
END IF;

I find this odd because the C equivalent would look like this:

if (a>b)
{

}
else
{
  c=a*b;
}

And the above type of code was frowned as a bad style on the C forum, which I know when posting newbies. Since PL / SQL does not allow empty blocks and always requires a NULL statement, does this type of coding style give any wrt readability advantages or is it just a matter of preference ?. FWIW, the guy who encoded PL / SQL with the above style is undoubtedly an experienced coder. Are there any advantages over the following?

IF a<=b THEN
  c:=a*b;
END IF;

Answer 1

, a <= b , - . .

c = a*b , a null. . , a b , :

IF a<=b or (a is null) or (b is null) THEN
  c:=a*b;
END IF;

Answer 2

, , , , ELSE IF. , , IF, , ; .