fix(explore): make to convert null to N/A in view results

[prosdev0107]

SUMMARY

NULL values not showing up in View Results in Explore

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

BEFORE:

AFTER:

TESTING INSTRUCTIONS

How to reproduce the issue

1. Go to Chart Table. (can try with cleaned_sales_data datasets)
2. Set the Group BY as territorry field
3. Set the Metrics as SUM(price_each)
4. Run the chart
5. Table has the null value, this is displayed as N/A
6. But in View results, Table don't show null value as N/A like viz chart table.

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 #19316 (308e39c) into master (d10a3d8) will decrease coverage by 0.00%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##           master   #19316      +/-   ##
==========================================
- Coverage   66.65%   66.65%   -0.01%     
==========================================
  Files        1672     1672              
  Lines       64611    64615       +4     
  Branches     6505     6506       +1     
==========================================
+ Hits        43066    43067       +1     
- Misses      19862    19864       +2     
- Partials     1683     1684       +1     

Flag	Coverage Δ
javascript	51.33% <25.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
.../src/explore/components/DataTableControl/index.tsx	71.62% <25.00%> (-2.67%)	⬇️

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[zhaoyongjie]

LGTM