Fix handling of converted undefined floats

[bep]

Relates to the fix in 93e6518

See gohugoio/hugo#12793

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.81%. Comparing base (93e6518) to head (bb8b5bb).

Files	Patch %	Lines
metadecoder_exif.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
- Coverage   78.92%   78.81%   -0.12%     
==========================================
  Files          14       14              
  Lines        1343     1345       +2     
==========================================
  Hits         1060     1060              
- Misses        201      202       +1     
- Partials       82       83       +1     

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