fix: infinite bad loop caused by unexpected worktree directory removal

[bakome]

Prevent infinite bad loop which happen when unexpected worktree directory removal happen.

Fix issue: #827

[linux-foundation-easycla]

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• ✅ login: bakome / name: Aleksandar Markovski (a1a47b7)

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[thockin]

I think there are some more tests I can add to highlight this, but it's a good fix. Thanks.