On C-c, only cancel base CESK if it is currently running #2008
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Fixes #2007. After #1928, we handle exceptions a little differently, so it no longer works to simply set the base's CESK machine to an
Up
(exception) state no matter what. Instead we have to first check if the base is running, and if so set it toUp
as before; if not, do nothing (except clear the REPL prompt).