fix(getInteractiveContent): add null checks

[tay1orjones]

Based on some conversations with @fbarroso24: When using react-test-renderer to test components using this hook/function, the component will error with

TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator))

This PR adds some null checks to avoid iterating over non-iterable Symbols passed to this function stemming from the react-test-renderer environment.

Changelog

Changed

• modify getInteractiveContent to include null checks

Testing / Reviewing

• Check to make sure Popover, Tooltip, IconButton stories are not be impacted and work as intended
• @fbarroso24 has already tested this fix locally to ensure it fixes the issue he's reported

[fbarroso24]

Thanks @tay1orjones!

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[tw15egan]

LGTM 👍 ✅