fix 'convert' with single commit repositories The attached patch passes the three 'convert' testcases, and also is able to successfully convert the git.git repository.

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adding da/foo

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adding foo

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% manifest

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200 Script output follows

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drwxr-xr-x da

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-rw-r--r-- 4 foo

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200 Script output follows

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-rw-r--r-- 4 foo

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