[FIX] Fix tests and lint

[JakaKokosar]

Issue

Description of changes

Includes

• Code changes
• Tests
• Documentation

[codecov-commenter]

Codecov Report

Merging #341 (4c5bd6c) into master (49f49a0) will not change coverage.
The diff coverage is 55.95%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #341   +/-   ##
=======================================
  Coverage   48.31%   48.31%           
=======================================
  Files          67       67           
  Lines       10896    10896           
=======================================
  Hits         5264     5264           
  Misses       5632     5632           

Files Changed	Coverage Δ
...trib/bioinformatics/annotation/annotate_samples.py	100.00% <ø> (ø)
...ontrib/bioinformatics/widgets/OWClusterAnalysis.py	0.00% <0.00%> (ø)
...rangecontrib/bioinformatics/widgets/OWGOBrowser.py	0.00% <0.00%> (ø)
...trib/bioinformatics/widgets/OWGeneSetEnrichment.py	0.00% <0.00%> (ø)
...rib/bioinformatics/widgets/OWKEGGPathwayBrowser.py	0.00% <0.00%> (ø)
...ioinformatics/widgets/utils/gui/label_selection.py	21.33% <20.00%> (ø)
orangecontrib/bioinformatics/widgets/OWGenes.py	83.76% <83.33%> (ø)
...ngecontrib/bioinformatics/widgets/OWMarkerGenes.py	88.84% <92.50%> (ø)
...rib/bioinformatics/widgets/OWAnnotateProjection.py	93.92% <96.29%> (ø)
orangecontrib/bioinformatics/geo/__init__.py	100.00% <100.00%> (ø)
... and 4 more

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