Issue-107: Check bucket exists on is_dir

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (7bd2080) 100.00% compared to head (264b206) 79.03%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #108 +/- ## ============================================ - Coverage 100.00% 79.03% -20.97% ============================================ Files 6 6 Lines 1159 1159 ============================================ - Hits 1159 916 -243 - Misses 0 243 +243 ``` | [Files](https://app.codecov.io/gh/justindujardin/pathy/pull/108?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Justin+DuJardin) | Coverage Δ | | |---|---|---| | [pathy/\_\_init\_\_.py](https://app.codecov.io/gh/justindujardin/pathy/pull/108?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Justin+DuJardin#diff-cGF0aHkvX19pbml0X18ucHk=) | `98.68% <100.00%> (-1.32%)` | :arrow_down: | ... and [3 files with indirect coverage changes](https://app.codecov.io/gh/justindujardin/pathy/pull/108/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Justin+DuJardin)

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[justindujardin]

I don't have a good solution for running the tests from a fork because of my secrets. The local adapter tests pass, and the code looks good, so I'll merge this without triggering the auto-release until the build passes. Thanks for the fix!

[github-actions[bot]]

:tada: This PR is included in version 0.10.3 :tada:

The release is available on GitHub release

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