Fix: Elaborate on exception during training start crash

[ori-kron-wis]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.18%. Comparing base (6fc1538) to head (cd7c4e9).
⚠️ Report is 2 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (6fc1538) and HEAD (cd7c4e9). Click for more details.

HEAD has 64 uploads less than BASE

Flag	BASE (6fc1538)	HEAD (cd7c4e9)
	67	3

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3556       +/-   ##
===========================================
- Coverage   87.30%   74.18%   -13.12%     
===========================================
  Files         224      224               
  Lines       21011    21009        -2     
===========================================
- Hits        18344    15586     -2758     
- Misses       2667     5423     +2756     

Files with missing lines	Coverage Δ
src/scvi/train/_trainer.py	94.11% <100.00%> (+7.91%)	⬆️
src/scvi/train/_trainrunner.py	90.00% <100.00%> (+4.94%)	⬆️

... and 61 files with indirect coverage changes

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