fix: fix data with size zero

[tlambert03]

it's technically possible (and theoretically sound) to create an array with something like shape=(0, 512, 512). In that case, ndv simply shouldn't attempt to render. this fixes that

before you got:

UserWarning: Error fetching data: cannot reshape array of size 0 into shape (512,512)
  future.set_result(func(*args, **kwargs))

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.65%. Comparing base (f5a94ee) to head (f1333e2).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ndv/controllers/_array_viewer.py	0.00%	1 Missing ⚠️
src/ndv/models/_resolve.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #258      +/-   ##
==========================================
- Coverage   86.66%   86.65%   -0.02%     
==========================================
  Files          48       48              
  Lines        5684     5686       +2     
==========================================
+ Hits         4926     4927       +1     
- Misses        758      759       +1     

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