fix: handle db null values in array of subject codes

[NilsOveTen]

No description provided.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (5aa70cd) 83.90% compared to head (5a33ca9) 83.29%.

Files	Patch %	Lines
...lin/no/fdk/concept_catalog/model/CurrentConcept.kt	0.00%	0 Missing and 1 partial ⚠️
...n/no/fdk/concept_catalog/service/ConceptMappers.kt	0.00%	0 Missing and 1 partial ⚠️
...dk/concept_catalog/service/SkosApNoModelService.kt	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #301      +/-   ##
============================================
- Coverage     83.90%   83.29%   -0.62%     
+ Complexity      463      460       -3     
============================================
  Files            51       51              
  Lines          1628     1628              
  Branches        254      256       +2     
============================================
- Hits           1366     1356      -10     
- Misses          122      129       +7     
- Partials        140      143       +3     

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