Fixed case for empty folder
bug #12436 [Filesystem] Fixed case for empty folder (yosmanyga)

This PR was merged into the 2.3 branch.

Discussion
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[Filesystem] Fixed case for empty folder

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

The mirror function should work with an empty folder as source. It should create an empty folder on target path.

Commits
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5321741 Fixed case for empty folder