Add check null for g_dataChannel-sensors_medical_sensor-AtomGit

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已合并

Add check null for g_dataChannel #57

wuzhihuitmac创建于 2月25日从已删除 :OpenHarmony-5.0.3-Release 合入到 openharmony/sensors_medical_sensor： OpenHarmony-6.0-Release

Add check null for g_dataChannel #57

已合并

wuzhihuitmac创建于 2月25日

从已删除 :OpenHarmony-5.0.3-Release合入到openharmony/sensors_medical_sensor OpenHarmony-6.0-Release