Fixing crash while reordering pages in OverviewMode.

Change-Id: I67dcd71a8f15fbc737880306254c766f4dbadc58
diff --git a/src/com/android/launcher3/PagedView.java b/src/com/android/launcher3/PagedView.java
index 8181bea..a480312 100644
--- a/src/com/android/launcher3/PagedView.java
+++ b/src/com/android/launcher3/PagedView.java
@@ -1817,7 +1817,9 @@
                                 addView(mDragView, pageUnderPointIndex);
                                 onAddView(mDragView, pageUnderPointIndex);
                                 mSidePageHoverIndex = -1;
-                                mPageIndicator.setActiveMarker(getNextPage());
+                                if (mPageIndicator != null) {
+                                    mPageIndicator.setActiveMarker(getNextPage());
+                                }
                             }
                         };
                         postDelayed(mSidePageHoverRunnable, REORDERING_SIDE_PAGE_HOVER_TIMEOUT);