[backend] filter data null

[savacano28]

Proposed changes

Related issues

Checklist

• [ ] I consider the submitted work as finished
• [ ] I tested the code for its functionality
• [ ] I wrote test cases for the relevant uses case
• [ ] I added/update the relevant documentation (either on github or on notion)
• [ ] Where necessary I refactored code to improve the overall quality

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov[bot]]

Codecov Report

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

Project coverage is 26.83%. Comparing base (1337772) to head (f83d87f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1136 +/- ## ============================================ + Coverage 26.54% 26.83% +0.28% - Complexity 1058 1062 +4 ============================================ Files 471 471 Lines 11196 11196 Branches 569 569 ============================================ + Hits 2972 3004 +32 + Misses 8140 8108 -32 Partials 84 84 ```

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