handle focus when BaseComponent is an object

[akutch]

In cases where we useforwardRef, forwardRef returns an object rather than a react class/function. This means that BaseComponent.prototype is undefined and causes the following error:

[FranDias]

😮

[Friss]

I just ran into this in a side project and while adding a check for BaseComponent.prototype would work the other problem is that we still always set a ref.

We could make that conditional as well in the case of an arrow function component. I tried briefly looking into using React.forwardRef but I think that opens a big can of worms.

[aem]

fixed in #83