Fix error when unstaging file with no HEAD commit #100 #101
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This also fixes an issue with diffing staged files when there is no previous HEAD commit.
Under the issue, I have also mentioned that the Godot editor may need a change to be able to recover from the case when an unstaging/staging does not succeed. However, it seems that handling that error inside the plugin is easier to handle. So for now we can leave the editor as is, or at least for solving this particular issue.
Fixes #100