fix attribute completeness and add workaround for dashboard

[Gigaszi]

Description

Fix error where numpy float is used in the result figure. Add workaround to not provide a attribute_key to use indicator in dashboard.

New or changed dependencies

• None

Checklist

• [x] I have updated my branch to main (e.g. through git rebase main)
• [x] My code follows the style guide and was checked with pre-commit before committing
• [x] I have commented my code
• [x] I have added sufficient unit and integration tests
• [x] I have updated the CHANGELOG.md
• [x] round result value in result description to two digits
• [x] issue #802