PL/SQL check if query returns empty

I'm writing a procedure, and i need to check whether my select query returned an empty record or not. (In this example whether there is no x,y shelf)

How can i do that?

I tried this:

temp shelves.loadability%TYPE := NULL;
BEGIN

select loadability into temp from shelves where rownumber = x and columnnumber = y;
IF temp IS NOT NULL THEN
/* do something when it's not empty */
ELSE
/* do the other thing when it's empty */
END IF;

But the second branch of the if never works...

EDIT:

Oh, it was so easy...

temp shelves.loadability%TYPE;
BEGIN

select count(*) into temp from shelves where rownumber = x and columnnumber = y;
IF temp != 0 THEN
/* do something when it's not empty */
ELSE
/* do the other thing when it's empty */
END IF;

END;