'Return an iterable of "object descriptions", which are tuples with
five items:
* `name`     -- fully qualified name
* `dispname` -- name to display when searching/linking
* `type`     -- object type, a key in ``self.object_types``
* `docname`  -- the document where it is to be found
* `anchor`   -- the anchor name for the object
* `priority` -- how "important" the object is (determines placement
in search results)
- 1: default priority (placed before full-text matches)
- 0: object is important (placed before default-priority objects)
- 2: object is unimportant (placed after full-text matches)
- -1: object should not show up in search at all'

def get_objects(self):

    return []
