Fix two bugs for blank voice (empty speech): (#1403)

jianganghan

2024-02-29 f272eb4ef78e12a1ef4ae451b114f980a2682d51

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<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <stroke android:width="1dp" android:color="#000000" />
    <padding android:left="5dp" android:top="5dp" android:right="5dp" android:bottom="5dp" />
</shape>