fix(saved query): handle null sql field

[nytai]

SUMMARY

There's an error in the typing of SavedQueryObject, sql field can be null which causes the preview modal to error out.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TEST PLAN

• manually tested that a blank query does not error out in the saved query preview modal

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov-io]

Codecov Report

Merging #11679 (c14d6c6) into master (95246e8) will decrease coverage by 2.60%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #11679      +/-   ##
==========================================
- Coverage   62.86%   60.25%   -2.61%     
==========================================
  Files         889      843      -46     
  Lines       43054    41339    -1715     
  Branches     4016     3729     -287     
==========================================
- Hits        27064    24909    -2155     
- Misses      15811    16265     +454     
+ Partials      179      165      -14     

Flag	Coverage Δ
cypress	55.96% <0.00%> (?)
javascript	?
python	62.56% <ø> (-0.33%)	⬇️

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

Impacted Files	Coverage Δ
...ws/CRUD/data/savedquery/SavedQueryPreviewModal.tsx	10.86% <0.00%> (-74.32%)	⬇️
...uperset-frontend/src/dashboard/util/dnd-reorder.js	0.00% <0.00%> (-100.00%)	⬇️
...rset-frontend/src/dashboard/util/getEmptyLayout.js	0.00% <0.00%> (-100.00%)	⬇️
...dashboard/components/resizable/ResizableHandle.jsx	0.00% <0.00%> (-100.00%)	⬇️
.../src/dashboard/util/getFilterScopeFromNodesTree.js	0.00% <0.00%> (-93.48%)	⬇️
...src/dashboard/components/gridComponents/Header.jsx	10.52% <0.00%> (-86.85%)	⬇️
...rc/dashboard/components/gridComponents/Divider.jsx	13.33% <0.00%> (-86.67%)	⬇️
...set-frontend/src/views/CRUD/welcome/EmptyState.tsx	5.71% <0.00%> (-82.10%)	⬇️
...et-frontend/src/components/ListView/ActionsBar.tsx	11.11% <0.00%> (-81.20%)	⬇️
...et-frontend/src/components/Menu/LanguagePicker.tsx	0.00% <0.00%> (-80.00%)	⬇️
... and 372 more

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[nytai]

retriggering CI