chore: filter undefined operators

[zhaoyongjie]

SUMMARY

Remove undefined post-processing operators after build query.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

CI

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• 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 #20157 (d84ef57) into master (0bcc21b) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #20157   +/-   ##
=======================================
  Coverage   66.46%   66.46%           
=======================================
  Files        1721     1721           
  Lines       64512    64517    +5     
  Branches     6806     6807    +1     
=======================================
+ Hits        42875    42879    +4     
- Misses      19905    19906    +1     
  Partials     1732     1732           

Flag	Coverage Δ
javascript	51.34% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...in-chart-echarts/src/MixedTimeseries/buildQuery.ts	100.00% <ø> (ø)
.../plugin-chart-echarts/src/Timeseries/buildQuery.ts	66.66% <ø> (ø)
...es/superset-ui-core/src/query/buildQueryContext.ts	100.00% <100.00%> (ø)
superset-frontend/src/explore/fixtures.tsx	66.66% <0.00%> (ø)
...perset-frontend/src/utils/getControlsForVizType.js	92.85% <0.00%> (ø)
...ntend/src/explore/controlUtils/getControlConfig.ts	100.00% <0.00%> (ø)
...plugins/legacy-plugin-chart-heatmap/src/Heatmap.js	0.00% <0.00%> (ø)

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[villebro]

LGTM, thanks for the cleanup 👍