fix(HeaderPanel): Initialize onHeaderPanelFocus with default value

[sjbeatle]

Changelog

Changed

• HeaderPanel has a prop, onHeaderPanelFocus, which is typed to be an optional function, but the component logic calls the function indiscriminately as if it were a required property. This is causing adopters to have errors when using HeaderPanel without that property defined.

Updating the component to initialize the optional prop with an inert function. I'm not sure if that's an acceptable fix, or not. Alternatives may be:

• Make onHeaderPanelFocus required
• Check for onHeaderPanelFocus being defined prior to calling it within the component's logic.

Testing / Reviewing

Specs have been added. Checkout this branch and run yarn test -- headerpanel with and without the onHeaderPanelFocus prop being initialized to see the fix.

    onHeaderPanelFocus = () => {},

vs.

    onHeaderPanelFocus,

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[tay1orjones]

Looks great, thanks for this! Just a couple minor suggestions

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[tay1orjones]

I don't think there's a way to override the DCO check specifically but we can merge with that one failing here I think.

[sjbeatle]

I don't think there's a way to override the DCO check specifically but we can merge with that one failing here I think.

Thanks @tay1orjones!!

Thank you for pushing those changes, as well. I made the noopFn update.... I think that was all. Please let me know if there's anything else you need from me for this PR. 😁