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Why is nitric acid added to sodium extract before adding silver nitrate for testing halogens?

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Why is nitric acid added to sodium extract before adding silver nitrate for testing halogens?
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Sodium extract is boiled with nitric acid to decompose NaCN and Na2S, if present, otherwise these

NaCN + HNO3        NaNO3 + HCN

Na2S + 2HNO3          2NaNO3 + H2S

Will react with AgNO3 and hence will interfere with test as shown below:

NaCN + AgNO3      AgCN + NaNO3

Na2S + 2AgNO3        Ag2S + 2NaNO3

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