BUG: Lazy_import not return None in a shared python env that contains cuda-related files on a cpu-only machine

[ChengjieLi28]

Related https://github.com/xorbitsai/xorbits/issues/595

Check code requirements

• [x] tests added / passed (if needed)
• [x] Ensure all linting tests pass

[codecov[bot]]

Codecov Report

Merging #50 (f71ffa7) into main (2683f2e) will increase coverage by 0.10%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
+ Coverage   89.00%   89.10%   +0.10%     
==========================================
  Files          47       47              
  Lines        3991     3991              
  Branches      760      760              
==========================================
+ Hits         3552     3556       +4     
+ Misses        356      350       -6     
- Partials       83       85       +2     

Flag	Coverage Δ
unittests	88.92% <ø> (+0.10%)	:arrow_up:

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see 2 files with indirect coverage changes

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