Merge "Prevent NPE when resetting divider bar visibility" into sc-v2-dev

quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java

@@ -1534,7 +1534,9 @@ public abstract class AbsSwipeUpHandler<T extends StatefulActivity<S>,
         boolean wasVisible = mWasLauncherAlreadyVisible || mGestureStarted;
         mActivityInterface.onTransitionCancelled(wasVisible, mGestureState.getEndTarget());
 
-        TaskViewUtils.setDividerBarShown(mRecentsAnimationTargets.nonApps, true);
+        if (mRecentsAnimationTargets != null) {
+            TaskViewUtils.setDividerBarShown(mRecentsAnimationTargets.nonApps, true);
+        }
 
         // Leave the pending invisible flag, as it may be used by wallpaper open animation.
         if (mActivity != null) {