Invalid schema created when node has no properties

[jessitron]

here's a simple reproduction:

create (b: Blackberry) -[:COLOR]-> (c: Yes { name: "purple"})

then open the client and click "Docs" to open the schema browser.
the electron graphql client says, when it tries to load the schema for its browsering:
Error: _BlackberryOrdering values must be an object with value names as keys.

This is also happening when I specify a schema, when it contains nodes with no properties. (This one is a serious problem for us)

[jexp]

Interestingly this only seems to be a problem on the client side, not the server side GraphQL libraries.
I fixed it.