Fix transcription viewer opening before transcription completes

[chidiwilliams]

No description provided.

[codecov]

Codecov Report

Merging #293 (18446a7) into main (d91a279) will increase coverage by 0.21%.
The diff coverage is 85.71%.

❗ Current head 18446a7 differs from pull request most recent head 8a18c7b. Consider uploading reports for the commit 8a18c7b to get more accurate results

@@            Coverage Diff             @@
##             main     #293      +/-   ##
==========================================
+ Coverage   77.32%   77.54%   +0.21%     
==========================================
  Files           8        8              
  Lines        1535     1541       +6     
==========================================
+ Hits         1187     1195       +8     
+ Misses        348      346       -2     

Flag	Coverage Δ
Windows	?
macOS	77.54% <85.71%> (+0.34%)	⬆️

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Impacted Files	Coverage Δ
buzz/gui.py	77.94% <85.71%> (+0.25%)	⬆️
buzz/transcriber.py	76.04% <0.00%> (+0.23%)	⬆️

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