Catch script run errors

[nelliemckesson]

Find a way to catch errors running scripts even when the error occurs in the script header (e.g., in a require). Can we capture all std_out and std_err messages to the json log somehow?

[mattretzer]

For ruby, a couple of thoughts:

• We could wrap whole scripts in rescue blocks...
• You can also redirect stderr &/or stdout; we could do that in line 1 or line 2 of a script for stderr; I did this in Validator here. But I had issues trying to do that and have it write to a logfile that another process is using during the script, so not sure we could write to the json log (unless we turned off stderr redirection write before logging at the end of the script)