Fix coupled resources extraction

[tusbar]

No description provided.

[codecov]

Codecov Report

Merging #95 into master will increase coverage by 4.16%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
+ Coverage    9.25%   13.42%   +4.16%     
==========================================
  Files          97       97              
  Lines        2183     2183              
==========================================
+ Hits          202      293      +91     
+ Misses       1981     1890      -91

Impacted Files	Coverage Δ
lib/metadata/iso/services.js	100% <100%> (+26.92%)	⬆️
lib/metadata/common/links.js	11.11% <0%> (+11.11%)	⬆️
lib/metadata/common/util.js	86.66% <0%> (+13.33%)	⬆️
lib/metadata/iso/thumbnails.js	37.5% <0%> (+37.5%)	⬆️
lib/metadata/iso/keywords.js	100% <0%> (+57.14%)	⬆️
lib/metadata/common/contacts.js	57.14% <0%> (+57.14%)	⬆️
lib/metadata/iso/categories.js	60% <0%> (+60%)	⬆️
lib/metadata/iso/statuses.js	60% <0%> (+60%)	⬆️
lib/metadata/iso/update-frequencies.js	60% <0%> (+60%)	⬆️
... and 3 more

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