Making sure that there is no notification when focus changes from something to nothing.

Change-Id: Ib8b3bdd7f5dd999c933a017fe1b34263afe38e4a

services/java/com/android/server/WindowManagerService.java

@@ -7822,8 +7822,8 @@ public class WindowManagerService extends IWindowManager.Stub
                             } catch (RemoteException e) {
                                 // Ignore if process has died.
                             }
+                            notifyFocusChanged();
                         }
-                        notifyFocusChanged();
                     }
                 } break;