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Bug: augpath raises TypeError when base is not explicitly provided

Bug: augpath raises TypeError when base is not explicitly provided: a task in repo2rlenv-swe-smith (Harbor dataset). boltons.pathutils.augpath raises a TypeError when called without the base keyword argument, because the internal base variable is None instead of the derived stem of the input path.

The task

`boltons.pathutils.augpath` raises a `TypeError` when called without the `base` keyword argument, because the internal `base` variable is `None` instead of the derived stem of the input path.

Part of FineEnvs/repo2rlenv-swe-smith.