Jupyter kernel dies when it can't find data

[sgpearse]

When we load a session that has missing data in Vapor's GUI we get an error message indicating the problem, but when loading the session in the API, the kernel dies without indicating what's wrong.

To reproduce, run the following script along with the attached session file that shouldn't find the targeted dataset.

from vapor import session
ses = session.Session()
ses.Load("/Users/<username>/Downloads/atpescA.vs3")
ses.Render("test.png")

atpescA.vs3.zip

[NihanthCW]

Hi @sgpearse I don't think #3435 is merged/ included in 3.9.

[sgpearse]

@NihanthCW I believe it was attempted with PR #3435. Sorry - you are corrcet.