Deleting a milestone != default milestone — at Initial Version
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We ended up deleting one of our milestones. The tickets are now displayed as milestone "(empty)". Judging from the SQL their milestone is NULL. New tickets, however, where the milestone dropdown box is left at the default value, are filed under "Milestone ", and I guess this means that the milestone is the empty string, "".
That means new tickets end up in a different milestone than the tickets from the deleted milestone, and I don't think there is any way to change the milestone from NULL to "".