Re-introduce #539 after understanding language_info KeyError

[glentakahashi]

See #570 and #539

Not sure why language_info is returning null for an aborted request, and if it happens consistently or only if the kernel runs code that has an error right before a language_info request is fired off.

If its the latter case, I think the expected behavior should be that kernel_info_request requests should be exempt from the "abort_on_error" functionality.