Fix checking imaAdMediaInfo nullness

It's intended to log a warning in this case, rather than throw.

Issue: #8290

#minor-release

PiperOrigin-RevId: 347790527

RELEASENOTES.md

@@ -52,6 +52,9 @@
  ([#3750](https:/google/ExoPlayer/issues/3750)).
  * Fix a condition where playback can get stuck before an empty ad
  ([#8205](https:/google/ExoPlayer/issues/8205)).
+ * Log a warning rather than throwing when reaching the end of the stream
+ with an ad playing but without ad media info
+ ([#8290](https:/google/ExoPlayer/issues/8290)).
  * Add `ImaAdsLoader.Builder.setEnableContinuousPlayback` for setting
  whether to request ads for continuous playback.
 * Metadata retriever:

extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/AdTagLoader.java

@@ -800,7 +800,7 @@ private void handlePlayerStateChanged(boolean playWhenReady, @Player.State int p
  && playWhenReady) {
  ensureSentContentCompleteIfAtEndOfStream();
  } else if (imaAdState != IMA_AD_STATE_NONE && playbackState == Player.STATE_ENDED) {
- AdMediaInfo adMediaInfo = checkNotNull(imaAdMediaInfo);
+ @Nullable AdMediaInfo adMediaInfo = imaAdMediaInfo;
  if (adMediaInfo == null) {
  Log.w(TAG, "onEnded without ad media info");
  } else {