Fix clustermap

[ahuang11]

Previously would crash:

Now makes it responsive (with loading + error raised)

new.mp4

[codecov]

Codecov Report

❌ Patch coverage is 95.12195% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.69%. Comparing base (30c842e) to head (ad76590).

Files with missing lines	Patch %	Lines
src/hv_anndata/plotting/clustermap.py	84.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #163      +/-   ##
==========================================
+ Coverage   77.86%   78.69%   +0.83%     
==========================================
  Files          25       25              
  Lines        1771     1840      +69     
  Branches      218      219       +1     
==========================================
+ Hits         1379     1448      +69     
- Misses        311      312       +1     
+ Partials       81       80       -1     

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