Dbms output printing white spaces

Question

when i loop thro the code, i get 20 rows but when it is tryign to print it, its printing white spaces. when i quesry the table, i can see data for those 20 rows. i cannot understand why dbms output is printing white spaces for this collection. i have the same results in toad and plsql editor.
declare
  -- Local variables here
  io_Loopid number :=651852;
   o_LoopSHELFpsr      NRW.t_SHELFpsr;
begin
  -- Test statements here
  io_Loopid:= 651852; -- DONT COPY THIS ONE. JUST TO UNIT TEST.  
    IF(io_Loopid <> -1) THEN
    -- determine the PSR values associated to teh To customer look of the order
      pkgapi.determinendwdownstream(o_psrlist =>  o_loopSHELFpsr,
                                       i_loopid =>  io_Loopid);
      dbms_output.put_line( ' no of rows coming back card list ' || o_loopSHELFpsr.count);
      For i in 1..o_loopSHELFpsr.count
      LOOP
      dbms_output.put_line(o_loopSHELFpsr(i).terminalid );
      dbms_output.put_line(o_loopSHELFpsr(i).TERMSYSID );
      dbms_output.put_line(o_loopSHELFpsr(i).CARDTYPEID );
      END LOOP;
    END IF ;
end;

Answer 1

show us that the collection data is not null. i.e. use:
     dbms_output.put_line(nvl(to_char(o_loopSHELFpsr(i).terminalid), 'null') );
....Amiel Davis