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 am: 0ee32dcd

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

Change-Id: I750b5d50b3fbdd7153aea85d7df36f0bce4e3715