Adding null check to outline generator

Change-Id: I8eb8b62a868d80fd0a7c9deec8915828bd8177d0
diff --git a/src/com/android/launcher3/HolographicOutlineHelper.java b/src/com/android/launcher3/HolographicOutlineHelper.java
index 4a04d03..5ff85d6 100644
--- a/src/com/android/launcher3/HolographicOutlineHelper.java
+++ b/src/com/android/launcher3/HolographicOutlineHelper.java
@@ -157,6 +157,9 @@
 
     Bitmap createMediumDropShadow(BubbleTextView view) {
         Drawable icon = view.getIcon();
+        if (icon == null) {
+            return null;
+        }
         Rect rect = icon.getBounds();
 
         int bitmapWidth = (int) (rect.width() * view.getScaleX());