Johannes Schlatow 7d143087c9 xml_node: change with_sub_node signature
The `with_sub_node` method is renamed to `with_optional_sub_node` to
better reflect that the non-existence of a sub node with the desired type is
ignored.
At the same time, the new `with_sub_node` now takes a second functor that is
called when no sub node of the desired type exists.

genodelabs/genode#4600
2022-09-19 14:00:33 +02:00
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