Report errors back from a run in a file

[samaybar]

If you are running a config file that does a lot of requests (e.g. Tableau report), it is easy to miss if there were errors, so you may be missing some data. It would be nice to write out a file to the output directory that indicates any queries that did not run. (I know you can scroll back in the terminal, but if you are in a hurry you might not do it.)

[haganbt]

@samaybar - it may be better to stop the entire process? If the data set is invalid, then it needs to be rerun.

[samaybar]

@haganbt depends on the config you are running -- it could be that you only need to rerun one query.