Merge "[Settings] Avoid NPE when user enter WifiCallingSettings back and forth" into udc-d1-dev am: 1765c1dc6e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/23695884

Change-Id: Ic8c4d4ddb031a1d47ac359b78ba50b33048fab1b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>