Merge "Fix Talkback announcing null when changing color option" into sc-v2-dev am: 2d8522dd0e am: cdb496f450

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/16489046

Change-Id: Ibdf01a749db0a2a4df379626da29bc1ae3a71c01