remote cherry-pick failure with --treeless clone option

[ndhaller]

A Patchset for Tianocore Edk2 using remote cherry-pick from Tianocore Edk2-Staging fails with "Error: The branch does not exist" when the edkrepo project is cloned with "--treeless" filter option.

Running the Patchset remote cherry-pick steps manually with git failed at the git fetch step with error message "fatal: bad tree object"

For this case, "git fetch --refetch" avoids the "fatal: bad tree object" git fetch error, and might work as a workaround if "--treeless" cloned projects fail the initial 'git fetch' step.

Version: edkrepo v3.2.3

[ndhaller]

Related pull request:
#257