Fixing codecoverage

[SamFerracin]

Context: A few open PRs are failing because of indirect changes in the coverage of three files, all of which are unrelated to the given PRs. Here, I either add tests (where I know how to test) or # pragma: no cover to the problematic lines

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.63%. Comparing base (680bf64) to head (6f2ae27).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #395      +/-   ##
===========================================
+ Coverage    87.44%   87.63%   +0.18%     
===========================================
  Files           81       81              
  Lines         6142     6129      -13     
===========================================
  Hits          5371     5371              
+ Misses         771      758      -13     

Files	Coverage Δ
mrmustard/training/trainer.py	100.00% <ø> (+10.75%)	:arrow_up:

... and 2 files with indirect coverage changes

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[zeyueN]

I think codecov is wrong....

Tried running tests locally with prints inserted where codecov claims to be not covered, it is actually hitting those lines.

[SamFerracin]

I think codecov is wrong....

Tried running tests locally with prints inserted where codecov claims to be not covered, it is actually hitting those lines.

Mmmh interesting.. So what would you suggest we do? We could force this in with #pragma no cover?