Merge "Mark DataUsageState as nullable to avoid potential NPE risk" am: 0960af0bf3

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Settings/+/2217422

Change-Id: I459cae5f473576dd3d9c4f8ee6fa9e7f5581ad75
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>