If no branch is specified, use any advertised default, not just master #10
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If the FetchResult HEAD is a SymbolicRef then that is the default branch, build that, else if there is a master which points to the same object as HEAD, build that, else look for any branch that points to the same object as HEAD and build that.
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As of 5.10 jgit reads symrefs in pack capabilities and FetchResult can tell you the default branch.
If the FetchResult HEAD is a SymbolicRef then that is the default branch, build that,
else if there is a master which points to the same object as HEAD, build that,
else look for any branch that points to the same object as HEAD and build that.
That's the same logic as clone uses to determine which branch to start on.