Prune empty directories before uploading #6
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I observed a case on W023 where the usual "remove empty dir after upload" was failing.
Specifically, I was getting some "read error" around where that step should have occurred. Only unusual thing I noticed was that there were lots of empty dirs in the /upload tree. Manually removing the empty ones was enough to resolve the problem, though, I don't know if it was the root cause.
This PR adds that empty dir prune as a pre-step to uploading.