Merge "Hide scroll bar if recycler view has no items." into sc-dev am: bfd56a6d59

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14234630

Change-Id: I3a2cbd19b33490694739eb7a37e5622197c76278

src/com/android/launcher3/widget/picker/WidgetsRecyclerView.java

@@ -116,6 +116,7 @@ public class WidgetsRecyclerView extends BaseRecyclerView implements OnItemTouch
     public void onUpdateScrollbar(int dy) {
         // Skip early if widgets are not bound.
         if (isModelNotReady()) {
+            mScrollbar.setThumbOffsetY(-1);
             return;
         }