[backend] fix null pointer

[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]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 26.83%. Comparing base (733e23e) to head (f218fd7).

Files	Patch %	Lines
...main/java/io/openbas/importer/V1_DataImporter.java	0.00%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1134      +/-   ##
============================================
+ Coverage     26.55%   26.83%   +0.27%     
- Complexity     1058     1062       +4     
============================================
  Files           471      471              
  Lines         11192    11196       +4     
  Branches        567      569       +2     
============================================
+ Hits           2972     3004      +32     
+ Misses         8136     8108      -28     
  Partials         84       84              

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