fix: prevent crash in Holistic Landmarker when face is lost #1418
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HolisticLandmarkerでoutputFaceBlendshapesをtrueに設定した際、トラッキング対象の顔が検出されなくなるとクラッシュする問題を修正しました。
問題点
Getを呼び出す前にこのパケットが空であるかチェックを行っていなかったため、クラッシュが発生していました。
修正内容
faceBlendshapesPacketがnullまたはIsEmptyであるかを確認する処理を追加しました。