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: ab902d4d

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

Change-Id: Ie292d02ec2bb04aaa903d64003bedf8416c207f2