GetComponents assumes that default branch name is "master"

When using a stanza like this:

!TARGET   = $ARR
!TYPE     = git
!URL      = git@github.com:rhaas/Foo.git
!REPO_BRANCH = main
!REPO_PATH= $2
!CHECKOUT =
Foo/Foo

GetComponents fails with:

> bin/GetComponents --verbose --root . thornlists/grhydrox.th
-----------------------------------------------------------------
  Checking out module: Foo/Foo
      from repository: git@github.com:rhaas/Foo.git
                 into: ./arrangements
Executing: mkdir -p './repos'
Executing: git clone git@github.com:rhaas/Foo.git './repos/Foo'
Cloning into './repos/Foo'...
Executing: git tag -l
       In: './repos/Foo'
Executing: git checkout --track -b main origin/main
       In: './repos/Foo'
fatal: A branch named 'main' already exists.
Executing: mv './repos/Foo' './repos/Foo.branch.failed.1'

Warning: Could not checkout Foo/Foo, unable to switch to branch main. Any existing symlinks to Foo/Foo will be broken

This can be made to work by leaving out the REPO_BRANCH option altogether, which is doable but not ideal.

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