[AL-1858] Treat empty list as None

[AbhinavTuli]

🚀 🚀 Pull Request

Checklist:

• [ ] My code follows the style guidelines of this project and the Contributing document
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have kept the coverage-rate up
• [ ] I have performed a self-review of my own code and resolved any problems
• [ ] I have checked to ensure there aren't any other open Pull Requests for the same change
• [ ] I have described and made corresponding changes to the relevant documentation
• [ ] New and existing unit tests pass locally with my changes

Changes

• Empty lists now have the same behaviour as using None during appends and updates

[codecov[bot]]

Codecov Report

Merging #1813 (df529b8) into main (a6dca41) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1813      +/-   ##
==========================================
+ Coverage   92.84%   92.86%   +0.02%     
==========================================
  Files         230      231       +1     
  Lines       24541    24611      +70     
==========================================
+ Hits        22784    22856      +72     
+ Misses       1757     1755       -2     

Flag	Coverage Δ
unittests	92.86% <100.00%> (+0.02%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
hub/__init__.py	94.73% <100.00%> (+0.09%)	:arrow_up:
hub/api/tests/test_none.py	100.00% <100.00%> (ø)
hub/core/chunk_engine.py	94.93% <100.00%> (+0.05%)	:arrow_up:
hub/core/transform/test_transform.py	99.34% <100.00%> (+0.03%)	:arrow_up:
hub/util/bugout_reporter.py	91.56% <100.00%> (+0.89%)	:arrow_up:
hub/util/empty_sample.py	100.00% <100.00%> (ø)
hub/util/casting.py	85.13% <0.00%> (-1.36%)	:arrow_down:
hub/core/ipc.py	0.00% <0.00%> (ø)
hub/integrations/pytorch/dataset.py	92.74% <0.00%> (+0.02%)	:arrow_up:
... and 8 more

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