missing var_names in BasePlot

[FrancescaDr]

• Closes "Interactive" Dotplot version: check for available var_names #3387
• Tests included or not required because:

• Release notes not necessary because:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.45%. Comparing base (cce4bd6) to head (73f6c0b).
⚠️ Report is 110 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3460   +/-   ##
=======================================
  Coverage   75.44%   75.45%           
=======================================
  Files         113      113           
  Lines       13250    13254    +4     
=======================================
+ Hits         9997    10001    +4     
  Misses       3253     3253           

Files with missing lines	Coverage Δ
src/scanpy/plotting/_baseplot_class.py	91.64% <100.00%> (+0.09%)	⬆️

[flying-sheep]

Hi! var_names can’t just contain values from .var.index, but also other sources, handled by

sc.get.obs_df(adata, keys=keys, layer=layer, use_raw=use_raw, gene_symbols=gene_symbols)

One approach could be to add a warn_only: bool = False parameter to .sc.get.obs_df which could then be specified in the plotting function.