Fix NullpointerException for products having a category but no order-…

[lojzatran]

Original PR: #1133

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (d4ec809) 97.32% compared to head (3d603f6) 97.31%.

❗ Current head 3d603f6 differs from pull request most recent head e978e7b. Consider uploading reports for the commit e978e7b to get more accurate results

Files	Patch %	Lines
...ync/products/helpers/ProductReferenceResolver.java	0.00%	0 Missing and 1 partial ⚠️
...roducts/utils/ProductReferenceResolutionUtils.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1134      +/-   ##
============================================
- Coverage     97.32%   97.31%   -0.02%     
- Complexity     2686     2687       +1     
============================================
  Files           229      229              
  Lines          8521     8521              
  Branches        526      526              
============================================
- Hits           8293     8292       -1     
  Misses          142      142              
- Partials         86       87       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.