I talked to a tmux developer about this and learned that using the empty string for session names was not an intentional feature. It happened to work, but when tmux changed the way that sessions were looked up to support prefix matching, that broke it. (Because the empty string is the prefix of anything.) The real point of failure was that tmux did not throw an error when attempting to create a session with an illegal name. That will be fixed in tmux 1.5, so they tell me, so this bug report can be closed.
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