Fix NPE

Bug: 7024933
diff --git a/src/com/android/launcher2/Launcher.java b/src/com/android/launcher2/Launcher.java
index 8c73c29..4ae9c7d 100644
--- a/src/com/android/launcher2/Launcher.java
+++ b/src/com/android/launcher2/Launcher.java
@@ -2507,7 +2507,7 @@
                     dispatchOnLauncherTransitionEnd(fromView, animated, false);
                     dispatchOnLauncherTransitionEnd(toView, animated, false);
 
-                    if (!springLoaded && !LauncherApplication.isScreenLarge()) {
+                    if (mWorkspace != null && !springLoaded && !LauncherApplication.isScreenLarge()) {
                         // Hide the workspace scrollbar
                         mWorkspace.hideScrollingIndicator(true);
                         hideDockDivider();