chore: remove blank space from users filters

[lilykuang]

SUMMARY

• only show users filters with users that have first name or last name

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

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 #21346 (fec6b55) into master (ce3d38d) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #21346      +/-   ##
==========================================
- Coverage   66.61%   66.57%   -0.04%     
==========================================
  Files        1791     1791              
  Lines       68481    68446      -35     
  Branches     7299     7299              
==========================================
- Hits        45617    45570      -47     
- Misses      20978    20996      +18     
+ Partials     1886     1880       -6     

Flag	Coverage Δ
javascript	52.73% <0.00%> (-0.05%)	⬇️

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

Impacted Files	Coverage Δ
superset-frontend/src/views/CRUD/utils.tsx	64.28% <0.00%> (-0.52%)	⬇️
...rd/components/nativeFilters/FilterBar/keyValue.tsx	18.51% <0.00%> (-22.23%)	⬇️
...board/components/nativeFilters/FilterBar/index.tsx	60.14% <0.00%> (-5.80%)	⬇️
superset/views/utils.py	80.00% <0.00%> (-0.85%)	⬇️
superset/connectors/sqla/utils.py	88.63% <0.00%> (-0.58%)	⬇️
superset/security/manager.py	95.41% <0.00%> (-0.31%)	⬇️
superset/connectors/sqla/models.py	90.50% <0.00%> (-0.10%)	⬇️
superset/superset_typing.py	98.11% <0.00%> (-0.07%)	⬇️
superset/views/base_api.py	98.38% <0.00%> (-0.07%)	⬇️
superset/utils/core.py	90.39% <0.00%> (+0.39%)	⬆️

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[rusackas]

Tests would be a nice addition if possible, but the logic here is pretty straightforward, it seems.