Support of empty properties

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Update Gems

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Bump to version 0.1.2

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>