Make FormComponent invisible in all children are invisible

[freddyaboulton]

• I have searched to see if a similar issue already exists.
  We already do this on app start-up.

However, if during the session, all children are marked invisible, there will still be an empty form component rendered in the page. The logic for handling this is update_parent_visibility in the AppTree.

We can mark the form component as "hidden" when there is only a single child and its been made invisible. However to handle the case of multiple children, we need to fetch the latest visibility status from all the children. The problem is that the get_data callback only returns the props not the shared_props for some reason?

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