Fix/no subjects

[collinschwantes]

#55 fixed

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.14%. Comparing base (21aac5c) to head (7101968).

Files with missing lines	Patch %	Lines
R/extract_metadata_from_doi.R	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
- Coverage   87.21%   87.14%   -0.07%     
==========================================
  Files          10       10              
  Lines         915      918       +3     
==========================================
+ Hits          798      800       +2     
- Misses        117      118       +1     

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