What are the equivalents of CONTINUE and NULL in Fast Formulas compared to PL/SQL?

I'm looking for a way to bypass the current iteration of a loop and move on to the next one, similar to how CONTINUE works in other languages. Please suggest an equivalent solution?

Additionally, I'd like to know if there's a placeholder or a value that I can use to indicate an empty or null condition in an if statement, similar to how null is used in other languages.

Sample code below-

Continue:
WHILE (nidx < tcRecCount ) LOOP
(
  if isnull(l_absence) = 'N' then/*If l_absence is null*/

  (  

  CONTINUE  /*Continue to next iteration- I need keyword here*/

  )

)

NULL:

if isnull(l_absence) = 'N' then/*If l_absence is null*/