fix bug io transcripts merscope

[ArneDefauw]

fix for #144

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 61.62%. Comparing base (d9e0bfd) to head (c5f7059).

Files with missing lines	Patch %	Lines
src/harpy/io/_transcripts.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #149   +/-   ##
=======================================
  Coverage   61.62%   61.62%           
=======================================
  Files          91       91           
  Lines        6668     6668           
  Branches     1057     1057           
=======================================
  Hits         4109     4109           
  Misses       2126     2126           
  Partials      433      433           

Files with missing lines	Coverage Δ
src/harpy/io/_transcripts.py	19.04% <0.00%> (ø)

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