fix validate if value of fields does not exist in tables

[danangmassandy]

This is for https://github.com/kartoza/sawps/issues/2027

[github-actions[bot]]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
16854	16356	97%	0%	🟢

New Files

No new covered files...

Modified Files

No covered modified files...

updated for commit: c6152f5 by action🐍

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.25%. Comparing base (c23d0ff) to head (c6152f5). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2050 +/- ## ========================================== + Coverage 97.22% 97.25% +0.02% ========================================== Files 373 373 Lines 16601 16656 +55 ========================================== + Hits 16141 16198 +57 + Misses 460 458 -2 ```

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[lgkgh]

Jenkins Build Details:

Build status: SUCCESS Build duration: 9 min 21 sec