Catch exception thrown when checking new release; fixes #1797

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Codecov Report

Attention: Patch coverage is 75.00000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 45.76%. Comparing base (3ed94cd) to head (75a5738).

Files	Patch %	Lines
galette/lib/Galette/Util/Release.php	75.00%	6 Missing ⚠️

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Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #454      +/-   ##
=============================================
- Coverage      45.77%   45.76%   -0.02%     
- Complexity      6024     6025       +1     
=============================================
  Files            146      146              
  Lines          24417    24423       +6     
=============================================
  Hits           11178    11178              
- Misses         13239    13245       +6     

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