[SLSN] Catch convergence errors

[JulienPeloton]

IMPORTANT: Please create an issue first before opening a Pull Request.
Linked to issue(s): Closes #361

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b855ff1) 56.35% compared to head (d3e095e) 56.40%.

❗ Current head d3e095e differs from pull request most recent head 88ddffc. Consider uploading reports for the commit 88ddffc to get more accurate results

Files	Patch %	Lines
fink_science/slsn/feature_extraction.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #362      +/-   ##
==========================================
+ Coverage   56.35%   56.40%   +0.05%     
==========================================
  Files          36       36              
  Lines        1629     1631       +2     
==========================================
+ Hits          918      920       +2     
  Misses        711      711              

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