Fixes an issue with backup/restore in build #3615
Merged
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Closes #3613
As part of the build process we do a backup commit when the build starts
then we revert 1 commit up to bring back the files at excatly the point
they where before the build. This works nice when there are any files
to commit but not when there is nothing to commit.
This PR resolves that by adding the --allow-empty flag to the backup
commit.