Calc dont allow to enter formula where first parameter as optional.

Steps:-
1. add following list2array macro to "My Macro" module
2. put a break point on "if ismissing(separator) or " .... line
3. come back to Calc to enter formula
4. enter =LIST2ARRAY(;;2)

Result actual:-
Error message prompt
   "OpenOffice.org Calc found an error in the formula entered.
    Do you want to accept the correction proposed below?"
see attachment:  ooo_first_optional.png


Result Expected:-
OpenOffice.org Calc should accept the formula as it is and processes.
As it will valid to have the first parameter missing per the macro declaration. 

(PS: related issue 88491)

==== list2array ====

function list2array( _
  optional list as string, _
  optional separator as string, _
  optional max as integer) 
  
  if ismissing(list) then
    list = ""
  end if 

  if ismissing(separator) or separator = ""  or separator = "0" then
    separator = ","
  end if 
  
  dim a()
  a = split(list, separator) 
  
  if ismissing(max) then
    'nothing
  elseif max < 1 then
    'nothing
  else
    redim preserve a(max-1)
  end if 
  list2array = a
end function