Protect the Settings application from potential null pointer exceptions.

Summary: The app bar is not available, causing a null pointer exception.

Test: Successful Build on master branch

Change-Id: I36849606f6587d6e7f004ae21e1a6e6a5206735a
Signed-off-by: Abdelrahman Daim <adaim@meta.com>

src/com/android/settings/applications/manageapplications/ManageApplications.java

@@ -1034,6 +1034,9 @@ public class ManageApplications extends InstrumentedFragment
     }
 
     private void autoSetCollapsingToolbarLayoutScrolling() {
+        if (mAppBarLayout == null) {
+            return;
+        }
         final CoordinatorLayout.LayoutParams params =
                 (CoordinatorLayout.LayoutParams) mAppBarLayout.getLayoutParams();
         final AppBarLayout.Behavior behavior = new AppBarLayout.Behavior();