feat: set NX_BASE to empty tree hash if HEAD~1 does not exist #167
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Update the BASE to be the empty git tree hash (the result of
git hash-object -t tree /dev/null
or4b825dc642cb6eb9a060e54bf8d69288fbee4904
), in the case where HEAD~1 doesn't exist.Demo: https://github.com/mandarini/text-shas-2/actions/runs/10612117442/job/29413110625