Merge "Fix npe in FrameHandler" into tm-dev am: 76a99eccc0 am: ce0ada92a3

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17534537

Change-Id: I96fa0489a9963c3ef0e23e2ec553781a6dc9ad60
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/quickstep/src/com/android/quickstep/ViewUtils.java b/quickstep/src/com/android/quickstep/ViewUtils.java
index ab26d15..1fef544 100644
--- a/quickstep/src/com/android/quickstep/ViewUtils.java
+++ b/quickstep/src/com/android/quickstep/ViewUtils.java
@@ -83,7 +83,7 @@
         }
 
         private boolean schedule() {
-            if (mViewRoot.getView() != null) {
+            if (mViewRoot != null && mViewRoot.getView() != null) {
                 mViewRoot.registerRtFrameCallback(this);
                 mViewRoot.getView().invalidate();
                 return true;