The function applying the search used the dummy search info for when
the item doesn't exist even when there was no UI data associated with
the node at all.
A fix is to only add the search menu when there is attribute info
stored for the node. This is something I wanted to do anyway, since
it makes it look more purposeful when there are no attribute info
for a node, less like a bug.
Differential Revision: https://developer.blender.org/D11016
d7caae56c4