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

jianganghan

2024-02-29 f272eb4ef78e12a1ef4ae451b114f980a2682d51

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<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#512BD4</color>
    <color name="colorPrimaryDark">#2B0B98</color>
    <color name="colorAccent">#2B0B98</color>
</resources>