am b68e03a8: Fix NPE

* commit 'b68e03a83cfc8e59c0c93d070c5e3cc13cc2996b':
  Fix NPE
diff --git a/src/com/android/launcher2/Launcher.java b/src/com/android/launcher2/Launcher.java
index 2c0f6b0..b2c36ee 100644
--- a/src/com/android/launcher2/Launcher.java
+++ b/src/com/android/launcher2/Launcher.java
@@ -1293,7 +1293,11 @@
                         final ViewTreeObserver.OnDrawListener listener = this;
                         mWorkspace.post(new Runnable() {
                                 public void run() {
-                                    mWorkspace.getViewTreeObserver().removeOnDrawListener(listener);
+                                    if (mWorkspace != null &&
+                                            mWorkspace.getViewTreeObserver() != null) {
+                                        mWorkspace.getViewTreeObserver().
+                                                removeOnDrawListener(listener);
+                                    }
                                 }
                             });
                         return;