Get code to crash more neatly

[jdkio]

Right now edep sim will produce a nearly empty root file if genie crashes. And then there are two or three errors in the log file instead of just the genie error, which is confusing for new users who are most likely to crash genie. Can be stopped by only running edep if there's an input genie file and so on.

Ideally we'd also stop the crashes but that's a stretch goal. We'd need to make sure genie has all the correct inputs during the python script.