Sparse matrix fix

[alam-shahul]

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Description

How has this been tested?

Closes

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 68.68%. Comparing base (4a632d6) to head (b012df3).
Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
src/squidpy/gr/_utils.py	50.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #898      +/-   ##
==========================================
- Coverage   69.99%   68.68%   -1.32%     
==========================================
  Files          39       38       -1     
  Lines        5532     5572      +40     
  Branches     1037     1186     +149     
==========================================
- Hits         3872     3827      -45     
- Misses       1367     1448      +81     
- Partials      293      297       +4     

Files with missing lines	Coverage Δ
src/squidpy/gr/_utils.py	59.65% <50.00%> (-0.70%)	⬇️

... and 10 files with indirect coverage changes