Fixes `this-siblings` item alias behavior.
Fixes `this-siblings` item alias behavior.

PukeCloud/django-sitetree,idlesign/django-sitetree,ikresoft/django-sitetree,PukeCloud/django-sitetree,RamezIssac/django-sitetree,RamezIssac/django-sitetree,caktus/django-sitetree,caktus/django-sitetree,ikresoft/django-sitetree,idlesign/django-sitetree