message: Changed fallback color
  Shouldn't come into play, because getBackgroundTint isn't null, but white is better background for bottom app bar
diff: @@ -41,7 +41,7 @@ public class BottomAppBarView extends BottomAppBar {
  public BottomAppBarView(@NonNull Context context) {
  super(context, null);
  - defaultBackgroundColor = getBackgroundTint() != null ? getBackgroundTint().getDefaultColor() : Color.BLACK;
  + defaultBackgroundColor = getBackgroundTint() != null ? getBackgroundTint().getDefaultColor() : Color.WHITE;
  defaultOverflowIcon = getOverflowIcon();
  CoordinatorLayout.LayoutParams params = new CoordinatorLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
  params.gravity = Gravity.BOTTOM;
  