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efl_ui_pack: allow NULL as existing parameter in after and before

Authored by Marcel Hollerbach <mail@marcel-hollerbach.de> on Sep 23 2019, 1:03 PM.

Description

efl_ui_pack: allow NULL as existing parameter in after and before

Summary:
with this commit all implementations of Efl.Pack_Linear to permit NULL
as existing parameter, this is verified with a spec test unit.

fixes T8210

Reviewers: zmike, segfaultxavi

Reviewed By: zmike

Subscribers: woohyun, Jaehyun_Cho, YOhoho, segfaultxavi, zmike, cedric, reviewers, committers

Tags: efl

Maniphest Tasks: T8210

Differential Revision: https://phab.enlightenment.org/D10023