Backport PR #1458 on branch 0.15.x (SCANVI bug fixes)

[meeseeksmachine]

Backport PR #1458: SCANVI bug fixes

[codecov]

Codecov Report

Merging #1459 (116fe44) into 0.15.x (56d3ece) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           0.15.x    #1459      +/-   ##
==========================================
+ Coverage   90.97%   91.04%   +0.06%     
==========================================
  Files         111      111              
  Lines        8743     8762      +19     
==========================================
+ Hits         7954     7977      +23     
+ Misses        789      785       -4     

Impacted Files	Coverage Δ
scvi/data/fields/_scanvi.py	100.00% <100.00%> (+3.12%)	⬆️
scvi/model/_scanvi.py	93.79% <100.00%> (+0.19%)	⬆️
scvi/model/base/_archesmixin.py	90.76% <100.00%> (+0.21%)	⬆️
scvi/module/_scanvae.py	80.50% <100.00%> (+1.80%)	⬆️
scvi/module/_vae.py	93.99% <100.00%> (+0.85%)	⬆️
scvi/data/_utils.py	86.27% <0.00%> (+0.98%)	⬆️

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[adamgayoso]

@jjhong922 reason this fails is a new jinja release on pypi has some breaking changes in nbsphinx. We can just wait it out