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If a point had no tags at all and was asked for the subset of tags with at least one key, it would return a new set of tags that was completely empty. In contrast, if the point had any tags at all, it would return a set of tags with the tag value being an empty string. This lead to a point with no tags being treated differently than a point with at least one tag. Fixing this so the tag value will always be an empty string for consistency. A missing tag should always be empty.
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