Ouranosinc / xclim / 17238491589

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Fix build-up index (#2225)

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### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #2145
- [x] Tests for the changes have been added (for bug fixes / features)
- [ ] (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?
When both DMC and DC are 0, the denominator in the division is NaN and
the output of the BUI is 0, which avoids a division by 0 error and
reproduces the official output.

### Does this PR introduce a breaking change?
No.

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