Hard dependency to djangoldp_account

Form @Marjolaine here: https://git.happy-dev.fr/startinblox/applications/sib-site-package/issues/1

when I try to do a sib-install of the sib-server, I have this error :

if get_user_model()._meta.serializer_fields is None:
AttributeError: 'Options' object has no attribute 'serializer_fields'