Minor improvements

[moinfar]

• Test on general tutorial
• Make sure one can load data from previous versions

[codecov]

Codecov Report

❌ Patch coverage is 91.12903% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.72%. Comparing base (89b24cd) to head (859ba18).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/drvi/scvi_tools_based/nn/_base_components.py	90.52%	9 Missing ⚠️
src/drvi/nn_modules/layer/linear_layer.py	88.88%	1 Missing ⚠️
src/drvi/scvi_tools_based/module/_drvi.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
+ Coverage   80.48%   80.72%   +0.24%     
==========================================
  Files          42       42              
  Lines        2429     2480      +51     
==========================================
+ Hits         1955     2002      +47     
- Misses        474      478       +4     

Files with missing lines	Coverage Δ
src/drvi/nn_modules/prior.py	89.13% <100.00%> (ø)
...i/scvi_tools_based/model/base/_generative_mixin.py	78.44% <100.00%> (+0.18%)	⬆️
src/drvi/utils/tools/_latent.py	71.05% <100.00%> (+3.40%)	⬆️
src/drvi/nn_modules/layer/linear_layer.py	94.73% <88.88%> (+0.09%)	⬆️
src/drvi/scvi_tools_based/module/_drvi.py	87.54% <88.88%> (-0.20%)	⬇️
src/drvi/scvi_tools_based/nn/_base_components.py	84.38% <90.52%> (+0.95%)	⬆️

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