Merge branch 'vv/branch-recurse-no-start-ref' into jch

The --recurse-submodules option in 'git branch' has been fixed to avoid a crash when the start point is not a reference (e.g., a raw object ID). The creation path now skips setting up tracking and properly forwards the absent tracking name to the submodule helper. * vv/branch-recurse-no-start-ref: branch: allow recursion with no tracking name branch: do not track a start point with no ref