fixing bug. Null value for temperatures should be ignored.

[AnalogJ]

fixes #393

[codecov-commenter]

Codecov Report

Merging #394 (2677796) into master (a01b8fe) will decrease coverage by 0.14%.
The diff coverage is 28.10%.

@@            Coverage Diff             @@
##           master     #394      +/-   ##
==========================================
- Coverage   32.69%   32.54%   -0.15%     
==========================================
  Files          51       54       +3     
  Lines        2753     3045     +292     
  Branches       61       66       +5     
==========================================
+ Hits          900      991      +91     
- Misses       1821     2018     +197     
- Partials       32       36       +4     

Flag	Coverage Δ
unittests	32.54% <28.10%> (-0.15%)	⬇️

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

Impacted Files	Coverage Δ
collector/pkg/collector/base.go	0.00% <ø> (ø)
webapp/backend/pkg/config/config.go	0.00% <0.00%> (ø)
webapp/backend/pkg/database/scrutiny_repository.go	12.60% <0.00%> (-0.92%)	⬇️
...end/pkg/database/scrutiny_repository_migrations.go	0.00% <0.00%> (ø)
...ckend/pkg/database/scrutiny_repository_settings.go	0.00% <0.00%> (ø)
...nd/pkg/database/scrutiny_repository_temperature.go	45.98% <0.00%> (-0.69%)	⬇️
webapp/frontend/src/app/layout/layout.component.ts	2.50% <20.00%> (ø)
...end/src/app/core/config/scrutiny-config.service.ts	42.85% <42.85%> (ø)
...bapp/frontend/src/app/shared/device-status.pipe.ts	64.70% <62.50%> (+54.70%)	⬆️
webapp/frontend/src/app/shared/file-size.pipe.ts	78.57% <76.92%> (-6.05%)	⬇️
... and 13 more

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