[6.x] Prevent deleted entries from being restored - #15310
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This pull request fixes an issue where a long-lived worker could recreate a deleted entry as an empty stub file.
This was happening because a stale in-memory Stache path could outlive the shared cached entry. A cache miss then attempted to parse the removed file, which generated and wrote a new entry.
This PR fixes it by returning no item when the path no longer exists.
Fixes #15225