fix(segment) Check folders is not empty

[d3v2a]

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Description

Fix panic in getAgnosterLeftPath when in a root directory

This PR fixes a runtime panic caused by an out-of-range index error in getAgnosterLeftPath.

Problem

The issue occurs when the current working directory is a root directory (e.g., /data), leading to an empty path segment list and triggering an out-of-bounds access:

panic: runtime error: index out of range [0] with length 0

goroutine 11 [running]:
github.com/jandedobbeleer/oh-my-posh/src/segments.(*Path).getAgnosterLeftPath(0xc000596000)
        D:/a/oh-my-posh/oh-my-posh/src/segments/path.go:356 +0x318

Solution

The fix ensures that the function properly handles cases where the path segment list is empty, preventing the panic.

[JanDeDobbeleer]

@all-contributors please add @d3v2a for code

This is pure magic 🪄! @holopin-bot @d3v2a wizard

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[allcontributors]

@JanDeDobbeleer

I've put up a pull request to add @d3v2a! 🎉