Completion causes a crash sometimes when lines are grabbed from history instead of typed.

$ bpython-curtsies>>> import subprocess>>> subprocess.call(['ls *'])<expected error happens><close bpython with ctrl-d>$ bpython-curtsies<up> <up> <enter><up> <up> <left> <left> <delete><unexpected crash>

We seem to be thinking we have completion when we don't (not clearing it properly perhaps? or not checking it properly?)