Update ulens_model_fit.py

[mjmroz]

Small changes in ex_16 to fix the problems that occur when adding extra parameters or fixing fluxes.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.52%. Comparing base (fe4e532) to head (3cc0210).

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  Coverage   83.52%   83.52%           
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  Files          52       52           
  Lines        8318     8318           
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  Hits         6948     6948           
  Misses       1370     1370           

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[rpoleski]

First two changes are taken from other branch.

Third change is an important one - Fitdata.source_fluxes should always be a np.array according to its docstring. This PR showed me that sometimes it is a list. The issue has to be fixed in fitdata.py, not here.

I don't fully understand the fourth change (blobs). Is it for cases with self._other_parameters defined? We should add proper printing of these other parameters in those cases.

[rpoleski]

Commit 970994c solved FitData.source_fluxes type.

[rpoleski]

First few changes applied here: 6ca7435 (he master changed since PR was created).
The last change should not change anything, then it's not applied.

Thanks for these suggestions.