Allow the path to be NULL, so that people can ask for information about a

Allow the path to be NULL, so that people can ask for information about a

2004-03-14  Federico Mena Quintero  <federico@ximian.com>

	* gtk/gtkfilesystem.c (gtk_file_folder_get_info): Allow the path
	to be NULL, so that people can ask for information about a
	parent-less file system root (e.g. get_info (get_folder ("/"), NULL)).

	* gtk/gtkfilesystemunix.c (gtk_file_folder_unix_get_info): Allow
	the condition describe above.

	* gtk/gtkfilechooserdefault.c (get_file_info): Allow getting
	information of root paths.

	* gtk/gtkpathbar.c (_gtk_path_bar_set_path): Handle root paths correctly.