Catch a rare NPE due in SuggestionController

In monkey test, suggestion service can detach right before UI tries to query.

Change-Id: Ic2eeb81140f5b5d38688fbe92d20f68b9fa48c34
Fixes: 69979152
Test: monkey

src/com/android/settings/dashboard/suggestions/SuggestionController.java

@@ -104,6 +104,9 @@ public class SuggestionController {
         }
         try {
             return mRemoteService.getSuggestions();
+        } catch (NullPointerException e) {
+            Log.w(TAG, "mRemote service detached before able to query", e);
+            return null;
         } catch (RemoteException e) {
             Log.w(TAG, "Error when calling getSuggestion()", e);
             return null;