Workaround for wallpaper crash. (5191436)

- Adding a little time to the tab transition

Change-Id: Ia7615d93f471845e568742df828cde43c1b917c4
diff --git a/src/com/android/launcher2/WallpaperChooserDialogFragment.java b/src/com/android/launcher2/WallpaperChooserDialogFragment.java
index c9e21f2..6e39da2 100644
--- a/src/com/android/launcher2/WallpaperChooserDialogFragment.java
+++ b/src/com/android/launcher2/WallpaperChooserDialogFragment.java
@@ -307,9 +307,15 @@
                     mBitmap.recycle();
                 }
 
-                mBitmap = b;
-                mWallpaperDrawable.setBitmap(b);
-                getView().postInvalidate();
+                View v = getView();
+                if (v != null) {
+                    mBitmap = b;
+                    mWallpaperDrawable.setBitmap(b);
+                    v.postInvalidate();
+                } else {
+                    mBitmap = null;
+                    mWallpaperDrawable.setBitmap(null);
+                }
                 mLoader = null;
             } else {
                b.recycle();