log: fix handling of root (or empty) path provided by matcher (issue6478) Since 27d6956d386b "match: use '' instead of '.' for root directory", '.' should be translated to ''. We can't blame repo.file() about this because an empty string is invalid as a file path, but I found at least two callers (_makematcher() and revset.filelog()) would crash because of this path[0]. So let's make repo.file() accept an empty string. path[0] == b'/' wouldn't work on Python 3 anyways.

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