conradchen b51692da7d [Transition] Fix NPE when removing window background
Null background is a totally valid state. Handles the nullness to prevent NPE from happening.

Resolves https://github.com/material-components/material-components-android/issues/2309

PiperOrigin-RevId: 386081632
2021-07-22 11:55:11 -04:00
..
2020-06-26 14:06:52 -04:00