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

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

Change-Id: I198d2557bbd966d105e7a8daf8665b3a10d26536