[deck_polygon] implement null locations flag

[mistercrunch]

[betodealmeida]

LGTM

[codecov-io]

Codecov Report

Merging #5948 into master will decrease coverage by 14.18%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master    #5948       +/-   ##
===========================================
- Coverage   77.77%   63.59%   -14.19%     
===========================================
  Files          46      393      +347     
  Lines        9391    23670    +14279     
  Branches        0     2635     +2635     
===========================================
+ Hits         7304    15052     +7748     
- Misses       2087     8605     +6518     
- Partials        0       13       +13

Impacted Files	Coverage Δ
superset/assets/src/explore/controls.jsx	46.66% <ø> (ø)
superset/viz.py	81.04% <100%> (+0.04%)	⬆️
superset/assets/src/components/Checkbox.jsx	100% <0%> (ø)
...ets/src/dashboard/components/dnd/DragDroppable.jsx	97.91% <0%> (ø)
superset/assets/src/components/EditableTitle.jsx	84.37% <0%> (ø)
...src/explore/components/controls/VizTypeControl.jsx	89.58% <0%> (ø)
...t/assets/src/components/InfoTooltipWithTrigger.jsx	58.82% <0%> (ø)
.../src/dashboard/components/UndoRedoKeylisteners.jsx	44% <0%> (ø)
...ts/src/explore/components/ExploreActionButtons.jsx	100% <0%> (ø)
...sets/src/dashboard/components/DashboardBuilder.jsx	92.75% <0%> (ø)
... and 341 more

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