Merge "Add null check to NavigationModeFeatureFlag" into sc-dev am: 024dd4ba47 am: a6c2424597

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14295521

Change-Id: Icbbbc402cc7d5c77f14b74006754aed3af43dc9b