Minor linting & small bug fixes

[mistercrunch]

No description provided.

[codecov-io]

Codecov Report

Merging #5561 into master will increase coverage by 0.13%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #5561      +/-   ##
==========================================
+ Coverage   63.23%   63.36%   +0.13%     
==========================================
  Files         351      351              
  Lines       22258    22258              
  Branches     2470     2470              
==========================================
+ Hits        14075    14104      +29     
+ Misses       8168     8139      -29     
  Partials       15       15

Impacted Files	Coverage Δ
superset/views/core.py	73.98% <ø> (ø)	⬆️
superset/legacy.py	18.3% <ø> (ø)	⬆️
...t/assets/src/visualizations/deckgl/layers/grid.jsx	0% <ø> (ø)	⬆️
superset/data/__init__.py	100% <ø> (ø)	⬆️
superset/viz.py	81.17% <100%> (+1.82%)	⬆️
superset/utils.py	89.07% <0%> (+0.18%)	⬆️

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