Fix fisher output

[joezuntz]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 62.84%. Comparing base (afe98b3) to head (c0d51a4).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
cosmosis/samplers/fisher/fisher_sampler.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #158      +/-   ##
==========================================
- Coverage   62.86%   62.84%   -0.03%     
==========================================
  Files         117      117              
  Lines       12777    12778       +1     
==========================================
- Hits         8032     8030       -2     
- Misses       4745     4748       +3     

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