Merge "Guard against the exceptions when launching a non-existing fragment"...

Merge "Guard against the exceptions when launching a non-existing fragment" into sc-dev am: 1f4eb8fb am: 8cdbad13

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/15142234

Change-Id: I741bfd7d164924d30f32ab0567bdcd85875e35d3