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Edward Thomson d81a85c5c2 fetch: test when HEAD points to nonexistent branch
When HEAD points to a nonexistent or invalid branch - for example, to
`refs/heads/` - the fetch should be permitted to continue, but we should
not use it when creating the `for merge` option in the FETCH_HEAD file.

(This emulates git's behavior.)
2021-06-30 08:58:12 -05:00
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