Simplify catching exceptions in the Graphical User Interface

[bartfeenstra]

No description provided.

[github-actions]

Uploaded Betty for commit 5688434. You can download it, test it, and post your feedback in a comment to this pull request 💕

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[codecov]

Codecov Report

Attention: 49 lines in your changes are missing coverage. Please review.

Comparison is base (9d188f7) 92.58% compared to head (5688434) 92.49%.
Report is 1 commits behind head on 0.3.x.

Files	Patch %	Lines
betty/gui/app.py	42.50%	23 Missing ⚠️
betty/gui/project.py	46.15%	21 Missing ⚠️
betty/extension/nginx/__init__.py	20.00%	4 Missing ⚠️
betty/gui/serve.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            0.3.x    #1295      +/-   ##
==========================================
- Coverage   92.58%   92.49%   -0.09%     
==========================================
  Files          81       81              
  Lines        9166     9156      -10     
==========================================
- Hits         8486     8469      -17     
- Misses        680      687       +7     

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