Fix warning in catch_unique_ptr::bool() (fixes #3011)

[tim-lyon]

Description

Return boolean value instead of implicit conversion (as, for example, is done here)

GitHub Issues

Closes #3011

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.90%. Comparing base (ccabd4d) to head (e41a1a9).
⚠️ Report is 1 commits behind head on devel.

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #3012   +/-   ##
=======================================
  Coverage   90.90%   90.90%           
=======================================
  Files         201      201           
  Lines        8648     8648           
=======================================
  Hits         7861     7861           
  Misses        787      787           

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[horenmar]

Thanks