better errors

[mike0sv]

closes #230

[codecov]

Codecov Report

Merging #253 (7f6b4be) into main (83f169f) will decrease coverage by 0.08%.
The diff coverage is 70.83%.

@@            Coverage Diff             @@
##             main     #253      +/-   ##
==========================================
- Coverage   89.23%   89.14%   -0.09%     
==========================================
  Files          77       77              
  Lines        5544     5565      +21     
==========================================
+ Hits         4947     4961      +14     
- Misses        597      604       +7     

Impacted Files	Coverage Δ
mlem/core/errors.py	91.52% <40.00%> (-4.78%)	⬇️
mlem/core/base.py	89.25% <71.42%> (-1.10%)	⬇️
mlem/contrib/docker/utils.py	83.95% <80.00%> (-0.56%)	⬇️
mlem/api/commands.py	88.28% <100.00%> (+0.58%)	⬆️
mlem/contrib/docker/base.py	87.16% <100.00%> (+0.06%)	⬆️
mlem/contrib/docker/context.py	86.12% <0.00%> (-0.58%)	⬇️

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