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Fix 'path cannot exist in repository' during diff for in-memory repository#6683
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Fixes obscure bug caused by change shown below in54a22f5.
For an in-memory repository without an index setup, nor any directory on-disk, git_repository_index_weakptr can now fail with a not found error returned by repository_index_path, as a consequence of this, attr_setup returns the not found error in this scenario, which then results in an error when attempting to lookup the driver for comparing a file during a diff.
Elsewhere, the not found errors are ignored within attr_setup directly, or indirectly by callers of that, but error is escaping via the diff driver lookup, hence fix added to ignore it directly within attr_setup.