Github user spmallette commented on the issue:
https://github.com/apache/tinkerpop/pull/818
> when removing nodes and/or edges, the collection of edges on a vertex can
end up containing null values
right, i think i followed that part - i was asking more about the "why"
nulls were showing up in the first place, but it sounds like you hadn't gotten
that far (not a problem - i understand that you're new to the code base). I
think we need to sort out the "why" before we merge a "fix" or else that fix
might not be the right one.
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