Better detection of empty directories when download-syncing Zarrs

[jwodder]

No description provided.

[codecov]

Codecov Report

Merging #961 (f9dfd6d) into master (d3dc616) will increase coverage by 0.04%.
The diff coverage is 94.11%.

@@            Coverage Diff             @@
##           master     #961      +/-   ##
==========================================
+ Coverage   87.27%   87.31%   +0.04%     
==========================================
  Files          65       65              
  Lines        8107     8118      +11     
==========================================
+ Hits         7075     7088      +13     
+ Misses       1032     1030       -2     

Flag	Coverage Δ
unittests	87.31% <94.11%> (+0.04%)	⬆️

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Impacted Files	Coverage Δ
dandi/download.py	87.24% <75.00%> (+0.29%)	⬆️
dandi/tests/test_download.py	100.00% <100.00%> (ø)

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[yarikoptic]

not clear from the description on how it is better, but seems to come with a test to demonstrate its superiority, so must be right :) Thank you @jwodder

[github-actions]

🚀 PR was released in 0.39.2 🚀