Error on icon prop in Button: "Warning: Each child in a list should have a unique "key" prop."

[RubenSibon]

Describe the issue

Summary

When setting the icon prop with an empty function, SVG or Icon component in a Button results in an error in the browser's console when running in a development environment: "Warning: Each child in a list should have a unique "key" prop."

Steps to reproduce

1. Render a Button with an icon in development environment: <Button icon={() => {}}>Button</Button>
2. Open the browser's console

Issue has been isolated and reproduced in CodeSandbox.

Environment

• Browser: any browser
• Operating System: any OS
• Version of the design system: 0.13.0

Checklist

• Search the issue tracker to ensure the issue has not already been reported.
• Verify that the issue can be consistently reproduced.
• Check if the issue is already documented.

Additional notes