safer attribute casting.

[AnalogJ]

fixes #523

[codecov-commenter]

Codecov Report

Merging #528 (e978676) into master (0febe3f) will decrease coverage by 1.75%.
Report is 71 commits behind head on master.
The diff coverage is 13.69%.

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@@            Coverage Diff             @@
##           master     #528      +/-   ##
==========================================
- Coverage   32.54%   30.80%   -1.75%     
==========================================
  Files          54       29      -25     
  Lines        3045     2724     -321     
  Branches       66        0      -66     
==========================================
- Hits          991      839     -152     
+ Misses       2018     1852     -166     
+ Partials       36       33       -3     

Flag	Coverage Δ
unittests	30.80% <13.69%> (-1.75%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
webapp/backend/pkg/web/server.go	62.26% <100.00%> (-4.41%)	⬇️
webapp/backend/pkg/config/config.go	0.00% <0.00%> (ø)
webapp/backend/pkg/notify/notify.go	35.39% <0.00%> (-0.37%)	⬇️
webapp/backend/pkg/models/measurements/smart.go	90.96% <50.00%> (-5.07%)	⬇️
...end/pkg/database/scrutiny_repository_migrations.go	0.00% <0.00%> (ø)
webapp/backend/pkg/database/scrutiny_repository.go	11.65% <0.00%> (-0.96%)	⬇️

... and 25 files with indirect coverage changes