Crash related to NTP background

[SergeyZhukovsky]

I found that crash in GPS on a stable channel 1.46.x. https://github.com/brave/brave-core/blob/1.46.x/android/java/org/chromium/chrome/browser/app/BraveActivity.java#L1130. root is null there

Crash stack:

Exception java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.ViewGroup.getChildAt(int)' on a null object reference
  at org.chromium.chrome.browser.app.BraveActivity.setBackground (BraveActivity.java:1130)
  at org.chromium.chrome.browser.ntp.BraveNewTabPageLayout$9.bgWallpaperRetrieved (BraveNewTabPageLayout.java:1193)
  at org.chromium.chrome.browser.ntp_background_images.util.FetchWallpaperWorkerTask.onPostExecute (FetchWallpaperWorkerTask.java:85)
  at org.chromium.chrome.browser.ntp_background_images.util.FetchWallpaperWorkerTask.onPostExecute (FetchWallpaperWorkerTask.java:23)
  at org.chromium.base.task.AsyncTask.finish (AsyncTask.java:454)
  at org.chromium.base.task.AsyncTask.lambda$postResult$1 (AsyncTask.java:146)
  at org.chromium.base.task.AsyncTask$$InternalSyntheticLambda$2$5e9fe5dcfd58c4d29792c212a265b4f9b111df523a5ac8e643d6204a2a0aa31d$0.run (AsyncTask.java:15)
  at android.os.Handler.handleCallback (Handler.java:978)
  at android.os.Handler.dispatchMessage (Handler.java:104)
  at android.os.Looper.loopOnce (Looper.java:238)
  at android.os.Looper.loop (Looper.java:357)
  at android.app.ActivityThread.main (ActivityThread.java:8090)
  at java.lang.reflect.Method.invoke (Method.java)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:548)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1026)