[BUG] Cannot pass None in OC query parameters

[Cole-Greer]

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Describe the bug
When using a parameterized openCypher query, None cannot be currently be passed in through the query parameters.

• OS: MacOS
• Browser: Firefox
• Graph Notebook Version: 4.1.0
• Graph Database & Version: Amazon Neptune 1.3.1.0

To Reproduce
Steps to reproduce the behavior:

1. Run these 2 cells in a notebook connected to Neptune 1.3.1.0:

params = {"X": None}

%%oc -qp params
CREATE (a:Person {name: $X})

2. See MalformedQueryException

Expected behavior

Expected behaviour is for it to correctly serialize as a null in the parameter json string and for the query to behave identically to the non-parameterized version.

[michaelnchin]

Thanks for the catch @Cole-Greer ! This has been fixed with #584 .