Summary:
CollectionView tries to access some properties from the base model so we
need to provide some implementation of the property getter/setter.
Reviewers: SanghyeonLee, cedric, felipealmeida
Reviewed By: SanghyeonLee
Subscribers: #reviewers, #committers
Tags: #efl
Differential Revision: https://phab.enlightenment.org/D10300