Handle null small icon

It shouldn't be possible to have a null small icon, but apparently
there are cases where we get one anyway. Might as well handle it
gracefully instead of crashing.

Bug: 67156108
Change-Id: I01ad0251920f7f531a3019eb694946c3d295f9de

src/com/android/launcher3/notification/NotificationInfo.java

@@ -73,7 +73,7 @@ public class NotificationInfo implements View.OnClickListener {
         if (icon == null) {
             // Use the small icon.
             icon = notification.getSmallIcon();
-            mIconDrawable = icon.loadDrawable(context);
+            mIconDrawable = icon == null ? null : icon.loadDrawable(context);
             mIconColor = statusBarNotification.getNotification().color;
             mIsIconLarge = false;
         } else {