[dune-functions] pdelab problems after dune-typetree changes

[Oliver Sander]

> thanks, that was the same problem as in functions in a different disguise. I now also added some safeguards
> to the member functions child() in TypeTree to make sure that they actually return a child and not the node itself.
Thanks!  Now my code builds again.
--
Oliver

>
> Steffen
>
>>> Best,
>>> Carsten
>>>
>>> [...]
>>>
>>>
>>>
>>>
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