fix(presto): expand data with null item

[ganczarek]

SUMMARY

A simple fix for #17469

TESTING INSTRUCTIONS

Run Presto engine tests:

tox -e py38 -- tests/integration_tests/db_engine_specs/presto_tests.py

ADDITIONAL INFORMATION

• Has associated issue: Presto engine: zip argument #1 must support iteration #17469
• Required feature flags: PRESTO_EXPAND_DATA
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #17470 (f510ad3) into master (211b32a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #17470   +/-   ##
=======================================
  Coverage   76.94%   76.95%           
=======================================
  Files        1042     1043    +1     
  Lines       56254    56324   +70     
  Branches     7785     7785           
=======================================
+ Hits        43286    43345   +59     
- Misses      12710    12721   +11     
  Partials      258      258           

Flag	Coverage Δ
hive	81.53% <100.00%> (+<0.01%)	⬆️
mysql	81.96% <100.00%> (+<0.01%)	⬆️
postgres	81.97% <100.00%> (+<0.01%)	⬆️
presto	81.84% <100.00%> (+<0.01%)	⬆️
python	82.47% <100.00%> (+<0.01%)	⬆️
sqlite	81.64% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
superset/db_engine_specs/presto.py	90.39% <100.00%> (+0.02%)	⬆️
superset/tasks/async_queries.py	91.02% <0.00%> (-5.95%)	⬇️
superset/charts/data/api.py	87.91% <0.00%> (-0.66%)	⬇️
superset/dashboards/dao.py	96.09% <0.00%> (-0.04%)	⬇️
superset/common/query_object_factory.py	89.79% <0.00%> (ø)
superset/common/query_context.py	92.00% <0.00%> (+0.14%)	⬆️
superset/common/query_object.py	93.06% <0.00%> (+0.16%)	⬆️
superset/charts/data/commands.py	100.00% <0.00%> (+2.12%)	⬆️

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[villebro]

Thanks for the fix @ganczarek + the awesome unit test! One comment before submitting this for broader review.

[villebro]

LGTM, but asking for a second pair of eyes

[villebro]

@john-bodley could you take a look and see if you agree with this change?

[villebro]

Since this is plugging a very specific bug, has very low risk of introducing regressions and adds good tests, I'll go ahead and merge this (we can do incremental improvements on this functionality later if needed).