Setting unused shadow to null

Change-Id: I1122cd9b6b01c18b2393ad6eb2dbc50b0460f78b
diff --git a/src/com/android/launcher3/BaseRecyclerViewFastScrollPopup.java b/src/com/android/launcher3/BaseRecyclerViewFastScrollPopup.java
index 1e714b3..da7fa41 100644
--- a/src/com/android/launcher3/BaseRecyclerViewFastScrollPopup.java
+++ b/src/com/android/launcher3/BaseRecyclerViewFastScrollPopup.java
@@ -119,6 +119,7 @@
             mShadow = HolographicOutlineHelper.obtain(
                     mRv.getContext()).createMediumDropShadow(mBg, false /* shouldCache */);
         } else {
+            mShadow = null;
             mBgBounds.setEmpty();
         }