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fix(dns): return NODATA instead of NXDOMAIN when a name exists with a… #374

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Return NODATA instead of NXDOMAIN when a name exists with another type

Should fix #373

When a TXT exists for a given name but a resolver queries another type, acme-dns will now return NODATA to prevent the resolver from caching a negative response for further TXT queries.

It still returns NXDOMAIN if the name does not exist at all.

…nother type

joohoi#373

When a TXT exists for a given name but a resolver queries another type,
acme-dns will now return NODATA to prevent the resolver from caching
a negative response for further TXT queries.

It still returns NXDOMAIN if the name does not exist at all.
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DNS server returns NXDOMAIN when it should not - preventing cache DNS from resolving the challenge
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