Fix NPE

Bug: 7356682
Change-Id: Ic6522da1ec6ac0d57f1565cef9c43949f2d7fd70
diff --git a/src/com/android/launcher2/DragLayer.java b/src/com/android/launcher2/DragLayer.java
index fed0ad9..e870d0a 100644
--- a/src/com/android/launcher2/DragLayer.java
+++ b/src/com/android/launcher2/DragLayer.java
@@ -167,6 +167,9 @@
 
     @Override
     public boolean onInterceptHoverEvent(MotionEvent ev) {
+        if (mLauncher == null || mLauncher.getWorkspace() == null) {
+            return false;
+        }
         Folder currentFolder = mLauncher.getWorkspace().getOpenFolder();
         if (currentFolder == null) {
             return false;