Fix bugs in the auto_schema script

[lebrice]

Fix various bugs in the auto-schema script:

• Trailing commas in vscode settings file caused errors.
• Wouldn't add entries in the vscode settings file if the code executable wasnt found, which is a problem on SLURM clusters where code might not be installed on PATH.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 70.99%. Comparing base (52c88ce) to head (ef846c4).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
project/utils/auto_schema.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
- Coverage   70.99%   70.99%   -0.01%     
==========================================
  Files          59       59              
  Lines        3551     3554       +3     
==========================================
+ Hits         2521     2523       +2     
- Misses       1030     1031       +1     

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