Merge "Prevent errors when updating operator pref summary" am: 5a19cea4ef am: c855a8a21a am: 455d7924c4

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Settings/+/1364660

Change-Id: I4721d6a74d655fca65f7a95ee996d3421581871e