Scrolling search results and autorotate cause crash

Activity.getCurrentFocus() can return null,
let's avoid a crash.

Bug: 111865137
Test: manual - Search in settings, scroll, rotate and scroll again.
Change-Id: I3d1437ee8dacc4dbd51f0b58df8a855b713668f0
diff --git a/src/com/android/settings/intelligence/search/SearchFragment.java b/src/com/android/settings/intelligence/search/SearchFragment.java
index 003a457..1ace8fc 100644
--- a/src/com/android/settings/intelligence/search/SearchFragment.java
+++ b/src/com/android/settings/intelligence/search/SearchFragment.java
@@ -359,9 +359,11 @@
         final Activity activity = getActivity();
         if (activity != null) {
             View view = activity.getCurrentFocus();
-            InputMethodManager imm = (InputMethodManager)
-                    activity.getSystemService(Context.INPUT_METHOD_SERVICE);
-            imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
+            if (view != null) {
+                InputMethodManager imm = (InputMethodManager)
+                        activity.getSystemService(Context.INPUT_METHOD_SERVICE);
+                imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
+            }
         }
 
         if (mResultsRecyclerView != null) {