Ensure pixel transformers are well-behaved when given an empty range of pixels

[robomics]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 79.16667% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 85.05%. Comparing base (0515529) to head (572fd43).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...lude/hictk/transformers/impl/to_dataframe_impl.hpp	77.27%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #182      +/-   ##
==========================================
- Coverage   85.06%   85.05%   -0.02%     
==========================================
  Files         120      120              
  Lines       10225    10238      +13     
==========================================
+ Hits         8698     8708      +10     
- Misses       1527     1530       +3     

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