PDF queue gets stuck

[ajwild]

It's not obvious what causes it, but the service occasionally gets stuck. This is probably because of an error unoconv which isn't caught, and the processing variable used to control the queue will be stuck as true.

Either quick-fix with a restart every night using pm2 reload pdfer or the /reset path, or try to reproduce the error and manage the queue in a smarter way. A 30 seconds per document timeout might be a good idea...