[BUG] Empty map/list in Gremlin results causes ValueError

[michaelnchin]

Describe the bug

There is an issue with running %%gremlin queries where there is a valueMap() or fold() step, and an empty list or map is returned in the results set. A ValueError exception occurs, and the widgets fail to display. This bug does not appear to affect results sets that are fully empty.

Desktop (please complete the following information):

• OS: MacOSX Monterey
• Browser: Firefox
• Version: 3.6.0