prevalence over time bar chart disappears when selecting no confidence interval

[fengelniederhammer]

resolves #311

Summary

The issue was a forgotten toString call.

Screenshot

PR Checklist

• [ ] All necessary documentation has been adapted.
• [ ] The implemented feature is covered by an appropriate test.

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Name	Status	Preview	Comments	Updated (UTC)
dashboard-components	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 10, 2024 7:48am

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This is a preview of the changelog of the next release:

0.5.2 (2024-07-10)

Bug Fixes

• components: prevalence over time: bar chart disappeared when selecting "None" confidence interval #311 (289937e)