Affichage chaine de caractère vide et non pas None

[codecov[bot]]

Codecov Report

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

Project coverage is 50.96%. Comparing base (3fa37e9) to head (84a32d4). Report is 2 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #566 +/- ## =========================================== + Coverage 50.90% 50.96% +0.06% =========================================== Files 37 37 Lines 2377 2380 +3 =========================================== + Hits 1210 1213 +3 Misses 1167 1167 ``` | [Flag](https://app.codecov.io/gh/PnX-SI/TaxHub/pull/566/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PnX-SI) | Coverage Δ | | |---|---|---| | [pytest](https://app.codecov.io/gh/PnX-SI/TaxHub/pull/566/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PnX-SI) | `50.96% <ø> (+0.06%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PnX-SI#carryforward-flags-in-the-pull-request-comment) to find out more.

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