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Bug
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Resolution: Fixed
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Normal
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None
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None
https://beta.musicbrainz.org/doc/Development/XML_Web_Service/Version_2#Browse currently says
Note that filtering is mandatory, if you don't specify type or status the release and release-group resources will not return any results.
but both http://musicbrainz.org/ws/2/release-group?artist=410c9baf-5469-44f6-9852-826524b80c61 and http://musicbrainz.org/ws/2/release?artist=410c9baf-5469-44f6-9852-826524b80c61 return results