Allow TransitionWithPresentation to return nil for conditional presentation.

Authored by featherless on May 16 2017, 12:31 PM.

Description

Allow TransitionWithPresentation to return nil for conditional presentation.

Summary: Returning nil means no presentation controller will be used.

Reviewers: O2 Material Motion, O4 Material Apple platform reviewers, Material Motion

Tags: Material Motion

Differential Revision: http://codereview.cc/D3229

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