fix: add conformsTo as blank node if missing uri but has valid title

[NilsOveTen]

resolve Informasjonsforvaltning/fdk-issue-tracker#992

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.66%. Comparing base (f33a1b5) to head (6ce1bf0).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...main/kotlin/no/fdk/dataset_catalog/rdf/RDFUtils.kt	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #198      +/-   ##
============================================
+ Coverage     78.39%   78.66%   +0.26%     
  Complexity      271      271              
============================================
  Files            29       29              
  Lines          1120     1120              
  Branches        261      261              
============================================
+ Hits            878      881       +3     
+ Misses           90       87       -3     
  Partials        152      152              

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