Guard against monkey crash.

Bug: 27784445
Change-Id: I4ba6e02e0cdb6857661a824ae0888feac6762a05

src/com/android/settings/dashboard/DashboardSummary.java

@@ -139,6 +139,7 @@ public class DashboardSummary extends InstrumentedFragment
     @Override
     public void onSaveInstanceState(Bundle outState) {
         super.onSaveInstanceState(outState);
+        if (mLayoutManager == null) return;
         outState.putInt(EXTRA_SCROLL_POSITION, mLayoutManager.findFirstVisibleItemPosition());
     }