Adding null check when creating icon bitmap

Bug: 24299267
Change-Id: I596e4a8dbd4e45cffff75e6cf7bbbf7ec45c8ec9
diff --git a/src/com/android/launcher3/Utilities.java b/src/com/android/launcher3/Utilities.java
index acc8090..6521f15 100644
--- a/src/com/android/launcher3/Utilities.java
+++ b/src/com/android/launcher3/Utilities.java
@@ -208,7 +208,7 @@
                 // Ensure the bitmap has a density.
                 BitmapDrawable bitmapDrawable = (BitmapDrawable) icon;
                 Bitmap bitmap = bitmapDrawable.getBitmap();
-                if (bitmap.getDensity() == Bitmap.DENSITY_NONE) {
+                if (bitmap != null && bitmap.getDensity() == Bitmap.DENSITY_NONE) {
                     bitmapDrawable.setTargetDensity(context.getResources().getDisplayMetrics());
                 }
             }