Previous and next video button for first and last video respectively on the Video Player results in crash

For reference the logs of the crash are as follows:

2020-04-10 11:24:00.174 8649-8649/com.example.android.tvleanback E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.android.tvleanback, PID: 8649
java.lang.NullPointerException: Attempt to read from field 'java.lang.String com.example.android.tvleanback.model.Video.title' on a null object reference
at com.example.android.tvleanback.ui.PlaybackFragment.play(PlaybackFragment.java:174)
at com.example.android.tvleanback.ui.PlaybackFragment.access$400(PlaybackFragment.java:72)
at com.example.android.tvleanback.ui.PlaybackFragment$PlaylistActionListener.onPrevious(PlaybackFragment.java:345)
at com.example.android.tvleanback.player.VideoPlayerGlue.previous(VideoPlayerGlue.java:165)
at androidx.leanback.media.PlaybackTransportControlGlue.dispatchAction(PlaybackTransportControlGlue.java:263)
at androidx.leanback.media.PlaybackTransportControlGlue.onActionClicked(PlaybackTransportControlGlue.java:194)
at com.example.android.tvleanback.player.VideoPlayerGlue.onActionClicked(VideoPlayerGlue.java:119)
at androidx.leanback.app.PlaybackSupportFragmentGlueHost$1.onItemClicked(PlaybackSupportFragmentGlueHost.java:64)
at androidx.leanback.app.PlaybackSupportFragmentGlueHost$1.onItemClicked(PlaybackSupportFragmentGlueHost.java:59)
at androidx.leanback.app.PlaybackSupportFragment$1.onItemClicked(PlaybackSupportFragment.java:159)
at androidx.leanback.widget.PlaybackTransportRowPresenter$2.onControlClicked(PlaybackTransportRowPresenter.java:573)
at androidx.leanback.widget.ControlBarPresenter$ViewHolder$3.onClick(ControlBarPresenter.java:164)
at android.view.View.performClick(View.java:5609)
at android.view.View.onKeyUp(View.java:10580)
at android.view.KeyEvent.dispatch(KeyEvent.java:2699)
at android.view.View.dispatchKeyEvent(View.java:9879)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1667)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1667)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1667)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1667)
at androidx.leanback.widget.PlaybackTransportRowView.dispatchKeyEvent(PlaybackTransportRowView.java:71)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1667)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1667)
at androidx.leanback.widget.BaseGridView.dispatchKeyEvent(BaseGridView.java:1015)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1667)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1667)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1667)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1667)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1667)
at com.android.internal.policy.DecorView.superDispatchKeyEvent(DecorView.java:403)
at com.android.internal.policy.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1800)
at androidx.core.view.KeyEventDispatcher.activitySuperDispatchKeyEventPre28(KeyEventDispatcher.java:130)
at androidx.core.view.KeyEventDispatcher.dispatchKeyEvent(KeyEventDispatcher.java:87)
at androidx.core.app.ComponentActivity.dispatchKeyEvent(ComponentActivity.java:133)
at com.example.android.tvleanback.ui.LeanbackActivity.dispatchKeyEvent(LeanbackActivity.java:76)
at com.example.android.tvleanback.ui.PlaybackActivity.dispatchKeyEvent(PlaybackActivity.java:89)
at com.android.internal.policy.DecorView.dispatchKeyEvent(DecorView.java:317)
at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:4327)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4298)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3849)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3902)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3868)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3995)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3876)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4052)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3849)
2020-04-10 11:24:00.174 8649-8649/com.example.android.tvleanback E/AndroidRuntime: at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3902)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3868)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3876)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3849)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3902)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3868)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4028)
at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:4189)
at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:2365)
at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:1961)
at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:1952)
at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:2342)
at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:141)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:323)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

Start in ui/PlaybackFragment.java at play() line 174 and trace the previous/next calls through player/VideoPlayerGlue.java, especially previous() around line 165. Reproduce the first-video previous and last-video next actions, then verify both boundary actions no longer crash and normal video navigation still works.

Written by the indexing model from the issue text.