I always leave them; thus, I am sure that I will never reuse the branch name, and any http links to the branch (in the documentation or reports) will not be violated.
If it really hurts you, because it was only a branch with functions, you can delete it if you combined everything with the trunk; you probably never bother to look at him again. But remember that he does nothing, just sits there; he will always be in history, whether he will pretend to be on his head or not. You will not โcleanโ anything by deleting it, you will actually just add the unnecessary revision to the repository.
Zac thompson
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