2000-06-13  Jody Goldberg <jgoldberg@home.com>

	* src/functions/fn-math.c (callback_function_sumproduct) : Handle
	  empty.
	(gnumeric_sumproduct) : Handle blank cells correctly, correct error
	  handling slightly.

	* src/func.c (iterate_cellrange_callback) : Handle empty cells.
	(function_iterate_do_value) : Add a new argument to control the
	  handling of empty cells.
	(function_iterate_argument_values) : Hard code the ignore_blanks
	  argument to TRUE the same as the previous behavior.