Merge "Add null pointer check for callback in HotwordDetectionConnection." into sc-dev am: f569f09b5a am: 7de35ab5c7 am: d2a76b46f3
Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15327988 Change-Id: I6e5cd47ab68cc5ceb6a93d121bd39edecfe3781a
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