Merge "Add non null check on mViewPager" into tm-dev am: 6c2c619d am: 199c5e12 am: 9966c5b5

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



Change-Id: Iea69831fd54bc1aed2d5cf1c102fa2bdf4006c63
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>