I removed this line because it was breaking partial support. I was getting
"MultipleInstanceError: Multiple incompatible subclass instances of InteractiveShellEmbed are being created."
and no plot of any kind. Removing the line would let at least a partial plot be displayed. I hadn't meant to include this change in this change set, but I just noticed it as I was looking back over the diff.

I can restore it if it needs to be there for other reasons.