Merge "Add non null check on mViewPager" into tm-dev am: 6c2c619d am: 199c5e12

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/18349770



Change-Id: I633f0b489b4b93b9c5035bb77b33d5882f3e1083
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>