[automerge] Check for nullness in WallpaperService onDestroy 2p: 784a9ec804

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22761496

Bug: 275361339
Change-Id: Ia62bcfe3c87d9f217069bfd359c17990edccf33e
Merged-In: I89076da179493fa282f3e59895cfa4f4bfb6bdfc

core/java/android/service/wallpaper/WallpaperService.java

@@ -2610,7 +2610,12 @@ public abstract class WallpaperService extends Service {
             mActiveEngines.get(i).detach();
         }
         mActiveEngines.clear();
-        mBackgroundThread.quitSafely();
+        if (mBackgroundThread != null) {
+            // onDestroy might be called without a previous onCreate if WallpaperService was
+            // instantiated manually. While this is a misuse of the API, some things break
+            // if here we don't take into consideration this scenario.
+            mBackgroundThread.quitSafely();
+        }
         Trace.endSection();
     }