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[TheSalocin]

while collecting upstream_nodes, upstream_edges_neighbors(G,node) returns a list of integers and Nones which leads to an error in indexing. I added a try except clause to return a list of integer values if the elements of the list aren't indexable.

[TheSalocin]

This was just a quickfix I made when running NEURD, and I didn't fully understand the function. Depending on what the expected behaviour is it might be better to return curr_upstream_nodes directly, add a clause to filter out NoneTypes, or add more defensive type checks