Ouranosinc / xclim / 35031034384

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Avoid white space for params in multi-shape distribution (#2428)

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### Pull Request Checklist:
- [ ] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #xyz
- [x] Tests for the changes have been added (for bug fixes / features)
- [x] (If applicable) Documentation has been added / updated (for bug
fixes / features)
- [x] CHANGELOG.rst has been updated (with summary of main changes)
- [x] Link to issue (:issue:`number`) and pull request (:pull:`number`)
has been added

### What kind of change does this PR introduce?

* `fit` would previously give e.g. `[' c', 'a', 'loc', 'scale']` for
`'gengamma'` distribution, and a white space for any distribution with
many shapes. This is now avoided, and correctly gives `['a',
'c','loc','scale']`

To be clear, `" c" != "c"` 

### Does this PR introduce a breaking change?
Yes, the coordinates to be expected are different now. 


### Other information:

1 of 1 new or added line in 1 file covered. (100.0%)

7990 of 8814 relevant lines covered (90.65%)

7.64 hits per line