Add error handlers for non-interactive operation

[planarnetwork]

Add error handlers for non-interactive operation

[linusnorton]

Yeah, it should either bail or continue processing other records. I'll look into that. Unfortunately that file is junk and they won't release a new one via the public site for a month or so.

[linusnorton]

It will now exit with -1 as soon as the error happens. It turns out it's actually rather complicated to handle that nicely. The code is grouping several promises for several db writes into a single promise. If one fails (as it did here) then the overall promise is rejected and the error handling then displays the message, closes the database and tries to exit. While the other promises are also rejected, they are not cancelled so they continue to use the database after it has been closed.

[mk-fg]

IMO it's a decent async workaround to the usual way of having something like await promise in each context where one was created, which is kinda equivalent to if err { ... } after each line (as one'd do in e.g. Go) instead of self-propagating exceptions.