handle case where text_view->layout == NULL by assuming its size is 0,

handle case where text_view->layout == NULL by assuming its size is 0,

2001-06-04  Havoc Pennington  <hp@redhat.com>

	* gtk/gtktextview.c (gtk_text_view_size_request): handle case
	where text_view->layout == NULL by assuming its size is 0,
	i.e. same as if we haven't done any reflow. Reported by
	Hidetoshi Tajima #55448