[BUG] Gremlin magic fails when results contain both list and vertex type

[michaelnchin]

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Describe the bug

In some cases, %%gremlin does not correctly handle queries that return both list and vertex type results.

• OS: Mac OS X
• Browser: Chrome
• Graph Notebook Version: 4.2.0
• Graph Database & Version: Amazon Neptune 1.3.1.0

To Reproduce
Steps to reproduce the behavior:

1. Execute the following from a notebook cell:

%%gremlin 

g.V().limit(1).inject([1,2,3,4])

2. Observe the TypeError being thrown.

[michaelnchin]

This is an extension of issue #386. A fix was added with #388, but this is incomplete as it only checks for dict types as the first element.