[master] More error handling

[codecov-io]

Codecov Report

Merging #943 into master will decrease coverage by 0.7%. The diff coverage is 86.7%.

@@           Coverage Diff            @@
##           master    #943     +/-   ##
========================================
- Coverage    94.5%   93.8%   -0.6%     
========================================
  Files         333     333             
  Lines       29559   29058    -501     
========================================
- Hits        27914   27245    -669     
- Misses       1645    1813    +168     

Impacted Files	Coverage Δ
guillotina/api/registry.py	85.8% <50.0%> (ø)
guillotina/db/storages/pg.py	88.1% <85.8%> (-1.0%)	:arrow_down:
guillotina/files/manager.py	100.0% <100.0%> (ø)
guillotina/tests/test_cockroach.py	17.7% <0.0%> (-77.9%)	:arrow_down:
guillotina/db/storages/cockroach.py	27.9% <0.0%> (-48.1%)	:arrow_down:
guillotina/db/strategies/dbresolve.py	68.5% <0.0%> (-31.5%)	:arrow_down:
guillotina/db/factory.py	85.3% <0.0%> (-7.7%)	:arrow_down:
guillotina/contrib/cache/api.py	54.6% <0.0%> (-6.9%)	:arrow_down:
guillotina/tests/fixtures.py	85.9% <0.0%> (-6.6%)	:arrow_down:
guillotina/tests/test_ws.py	95.9% <0.0%> (-4.1%)	:arrow_down:
... and 114 more