when there are no programs available for this file), and
	some related UI tweaking.

	* libnautilus-extensions/nautilus-program-chooser.c:
	(launch_mime_capplet), (launch_mime_capplet_and_close_dialog):
	Split old launch_mime_capplet into these two parts, so I
	could call the simpler one from two places.
	(run_program_configurator_callback),
	(nautilus_program_chooser_new): Moved the "Why not visit the
	Control Center?" box from the sub-dialog into the main dialog.
	Also created both a "Cancel" and "Done" button, only one of
	which is shown at a time.
	(nautilus_program_chooser_set_is_cancellable): New function,
	determines which of the two buttons "Cancel" and "Done" to
	display.
	(nautilus_program_chooser_show_no_choices_message):
	New function, puts up a modeless dialog telling user that
	there are no applications/viewers for this file and asking
	if they want to go to the File Types and Programs capplet.

	* libnautilus-extensions/nautilus-program-chooser.h:
	Prototype for nautilus_program_chooser_show_no_choices_message.

	* libnautilus-extensions/nautilus-program-choosing.c:
	(any_programs_available_for_file): New helper function.
	(nautilus_choose_component_for_file),
	(nautilus_choose_application_for_file): Reworked a bit to
	call nautilus_program_chooser_show_no_choices_message
	in the case where there are no choices at all.